WO1998022794A1 - Gas collecting apparatus - Google Patents
Gas collecting apparatus Download PDFInfo
- Publication number
- WO1998022794A1 WO1998022794A1 PCT/JP1997/004118 JP9704118W WO9822794A1 WO 1998022794 A1 WO1998022794 A1 WO 1998022794A1 JP 9704118 W JP9704118 W JP 9704118W WO 9822794 A1 WO9822794 A1 WO 9822794A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- gas
- case
- air pump
- collection
- collecting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2273—Atmospheric sampling
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0011—Sample conditioning
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
- G01N1/2214—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling by sorption
- G01N2001/2217—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling by sorption using a liquid
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
- G01N2001/241—Bellows
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T436/00—Chemistry: analytical and immunological testing
- Y10T436/25—Chemistry: analytical and immunological testing including sample preparation
- Y10T436/25875—Gaseous sample or with change of physical state
Definitions
- the present invention relates to a gas collection device that collects a gas to be tested such as a toxic gas that is released into the atmosphere and analyzes the concentration, and more particularly, to perform a high-precision test with a simple operation while achieving a compact device.
- the present invention relates to a gas collection device capable of performing an analysis of a gas concentration of a target gas.
- a method for concentrating and collecting trace gases is used, which is a collection container filled with a collected liquid, an air pump, a desiccant, a flow meter, A gas collecting device is composed of a volume flow meter (integrated flow meter), etc., and the air is introduced into the collected liquid at the survey site while measuring the suction amount, and the air is continuously bubbled through the liquid.
- the test gas in the atmosphere is dissolved in the solution and concentrated and collected. Then, the collected liquid is analyzed by a chemical method to determine the concentration of gas components in the solution, which is then converted to the concentration in the sucked air.
- JISA 598 “Particle Board” specifies a method for measuring the amount of formaldehyde emitted from wooden building materials. The way Cuts the material to be investigated into strips, puts it in a glass desiccator together with distilled water in a dish, and allows it to stand for a specified period of time to naturally dissolve formaldehyde in distilled water and collect it That is.
- the amount of gas emission per unit time can be estimated by examining the distilled water that has collected formaldehyde.However, in this method, the test specimen is extracted from the material to be investigated. Need to cut out. For this reason, it was impossible to inspect the completed building, and its scope was limited.
- An object of the present invention is to provide a gas collecting device capable of performing a highly accurate analysis of a gas concentration of a gas to be inspected with a simple operation and with a small size while achieving a compact device.
- the gas collection device according to the present invention is driven by a portable battery and injects a portable air pump that sucks a gas to be inspected into a space to be inspected and a collected liquid that collects the gas to be inspected from the gas.
- a collecting vessel one end of which is connected to the collecting vessel, and the other end of which is communicated with the space to be inspected, for introducing the gas into the collecting vessel, and one end of which is connected to the collecting vessel.
- a reservoir that stores the gas and functions as a volume meter; a drying unit that is provided between the reservoir and the collection container to dry the gas; and a pressure switch that detects an internal pressure of the reservoir.
- the reservoir A bypass flow path that bypasses the collection container and is connected to the intake port of the air pump; and a flow path that connects the reservoir to one of the exhaust port or the bypass flow path of the air pump. And switching means for connecting the exhaust port of the air pump to an open-to-atmosphere path when the reservoir is connected to the bypass flow path.
- the main storage box further includes a main storage box and a sub-storage box attached to the main storage box.
- the main storage box stores the air pump and the battery therein, and has the drying unit and the collection container on its outer surface.
- the sub-storage box has an attachment portion for accommodating the switching means and the pressure switch therein and for detachably attaching the storage body.
- the reservoir is a foldable and replaceable bag.
- the bag is a plastic bag.
- the collection container is formed of a transparent material, is used as a colorimetric tube, and is used as a reaction tube into which reagents that react with the gas to be inspected are injected.
- the pressure switch detects that the internal pressure of the storage body has reached a predetermined pressure, and outputs a stop signal for the air pump.
- the pressure switch is connected between the air pump and the buzzer and a power supply that supplies operating power to the air pump and the buzzer, and the pressure switch is connected to the storage body and receives the gas from the storage body.
- a bag-shaped extension member which is expanded and contracted by pressure, a cylindrical guide provided surrounding the extension member and guiding the direction of expansion of the extension member, and provided in opposition to the direction of expansion of the extension member.
- a switch body pressed by the extension member to selectively connect the common terminal and the two switching terminals. The switching terminals are connected to the buzzer and the air pump, respectively.
- a common terminal is connected to the power supply, and when the internal pressure of the reservoir reaches a predetermined pressure, the expansion member expands in response to the connection, and the connection with the common terminal is made upward from the air pump side switching terminal. It switched to the buzzer-side switching terminal.
- At least one of the introduction flow path and the suction flow path has a capillaries.
- the collection container is formed in a cylindrical shape, and its opening is closed with a cap.
- the introduction flow path and the suction flow path each have an injection needle-shaped tube, and these tubes penetrate through the cap and are inserted into the collection container.
- At least a portion of the cap that covers the opening of the collection container is covered with an insulating layer made of a material that does not affect the collection liquid.
- the tip of the injection needle-shaped tube is closed, and a communication opening is formed laterally near the tip.
- the switching means is connected to a speed adjusting switch for controlling a driving speed of the air pump by changing a supply voltage from the battery to the air pump in response to a switching operation of the flow path.
- the air pump is driven at a low speed when the exhaust port of the air pump is connected to the reservoir, and the air pump is driven at a high speed when the bypass passage is connected to the reservoir.
- a check valve is provided upstream of the intake port of the air pump, and the check valve allows the gas to flow only to the intake port.
- a fixed amount of 2 N—NaOH solution was injected as the collection liquid into the collection container, and the gas containing the gas to be inspected was passed through the collection container.
- the AHMT reagents were prepared using HC 1 0 4 quantitatively injected left for a predetermined time, while the indicated value to set I was adjusted to a predetermined value the standard color solution to the absorbance meter, then the collection quantified added KI 0 4 reagents as the reagents in the vessel, and set the the collecting vessel to the absorption spectrometer detects the formaldehyde concentration from the indicated value of this.
- a fixed amount of a 2N-KNO solution is injected into the collection container as the collection liquid, and the gas including the gas to be inspected is passed through the collection container, and then the reagents are contained in the collection container.
- AHMT reagent is injected in a fixed amount and left for a predetermined time.
- the standard color solution is set in an absorbance meter to adjust the indicated value to a predetermined value. was added quantify the KI 0 4 reagents were set to the collecting container in the absorption spectrometer detects the formaldehyde concentration from which the indicated value.
- the gas collecting apparatus is a portable air pump that is driven by a portable battery and sucks a gas in a space to be inspected, and a collection liquid that collects a gas to be inspected from the gas. And one end connected to the collection container and the other end An introduction passage communicating with the inspection target space and introducing the gas into the collection container; one end connected to the collection container and the other end connected to an intake port of the air pump; A suction passage for guiding the gas in the container to the air pump, a storage body connected to an air discharge port of the air pump, storing the gas discharged from the air pump, and functioning as a volume meter; A drying unit provided between the body and the collection container, for drying the gas; a pressure switch for detecting an internal pressure of the storage body; A bypass flow path connected to the intake port, and a flow path is switched so as to connect the storage body to one of the exhaust port and the bypass flow path of the air pump.
- Switching means for connecting the exhaust port of the air pump to the atmosphere when the air pump is connected to the bypass passage; and housing the air pump and the battery therein;
- a main storage box having a mounting surface for mounting a container, and a sub-storage having a mounting portion mounted on the main storage box for storing the switching means and the pressure switch therein and for detachably mounting the storage body.
- the collection container is formed of a transparent material, is used as a colorimetric tube, is used as a reaction tube into which reagents reacting with the gas to be tested are injected, and the pressure switch is Detects that the internal pressure of the reservoir has reached a predetermined pressure and outputs a stop signal of the air pump, and the reservoir is foldable and replaceable Tsu is grayed.
- the gas in the inspection target space is introduced into the collecting container by driving the air pump, and this gas is used as the collected liquid in the collecting container.
- the gas is passed through a drying means, sucked into the air pump, and the gas discharged from the air pump is stored in the storage body. Therefore, the storage body can be used as a volume meter.
- the collection container can be inspected as a reaction tube and a colorimetric tube with respect to the gas to be inspected collected by the collection liquid of the collection container, the collection liquid can be transferred or collected.
- the work of separating a part of the sample for analysis is not required, and the operability of chemical analysis can be improved.
- the storage means is changed by changing the flow path with the switching means.
- the gas in the reservoir can be sucked by an air pump and automatically discharged from the open air channel, and the reservoir can be emptied to prepare for the next collection. Therefore, the configuration of the gas collecting device is significantly simplified, it is inexpensive and can be miniaturized, and therefore the operability is significantly improved, and the gas collecting device can be handled without requiring skill.
- the pressure switch of the reservoir is linked to the air pump so that the air pump can be automatically stopped when the internal pressure of the reservoir reaches a predetermined pressure, so that the collecting operation can be automatically terminated.
- the opening of the collection container is closed with a cap, and the introduction flow path for introducing gas into the collection container and the suction flow path for introducing gas to the air pump each have a cabillary portion, and have an injection needle shape. Since the pipes are formed so as to be provided with these pipes, and these pipes are penetrated into the cap and attached, it is extremely easy to set and replace the collecting container, and the cabillary portion of the introduction flow path is formed. Since it can also serve as a gas flow resistance tube, gas flow can be stabilized and inspection accuracy can be improved. In addition, since at least a portion of the cap that covers the opening of the collecting container is covered with the insulating layer, the insulating layer prevents gas components generated from the cap from entering the collecting container. it can. For this reason, even when the collection liquid has been previously injected into the collection container, it is possible to prevent the gas component generated in the cap from affecting the collection liquid. The collection container can be stored for a long time in this state.
- the preservability of the collection container into which the collection liquid has been injected is significantly improved, a large number of containers can be made and stored at once. Then, the collection container containing the collection liquid can be distributed as a product, and the value of the product can be greatly improved as compared with the case where the collection container and the collection liquid are sold separately. Furthermore, the blank value is stable even when a large number is made and the analysis accuracy can be improved. Furthermore, since the cap does not affect the collected liquid, a cap using an inexpensive cap can be used.
- the pressure switch is interposed between the buzzer and the air pump and the power supply, and controls ON / OFF of the operation of the buzzer and the air pump, so that the inside of the storage body is filled with a certain amount of gas.
- the air pump can be automatically stopped to stop gas suction, and at the same time, the buzzer can be activated to notify the user of this fact. It can be configured to take measurements.
- this pressure switch is configured to selectively connect between the common terminal and the switching terminal of the switch body by expansion of an extension member to which gas pressure is introduced.
- the cost can be reduced and the device can be manufactured at low cost. Further, since the expansion of the extension member is guided by the guide, even if the gas pressure is small, this can be reliably detected, and the performance can be improved.
- the capillary flow path is provided between the collection port and the collection container.
- a filter is connected to the supply port, and the reference gas is the outside air purified by the filter.
- the supply port is provided with a reference gas container filled with the reference gas, and the reference gas is supplied from the reference gas container to the case.
- the gas collecting device is a gas collecting device, which covers an inspection target space in an airtight state from the outside and encloses a gas to be inspected which is radiated from the inspection target sealed therein.
- a connection path the other end of which is connected to the collection port, for introducing the gas into the collection vessel, and an end connected to the collection vessel, and the other end connected to the suction port of the air pump.
- a suction flow path that guides the gas in the collection container to the air pump; a reservoir that is connected to an exhaust port of the air pump, stores the gas discharged from the air pump, and functions as a volume meter;
- a capillary channel provided between the sampling port and the storage body for reducing the flow rate of the gas to be sucked, and provided between the storage body and the collection container to dry the gas; Drying means and the above
- a pressure switch for detecting an internal pressure of the reservoir, a bypass flow path connecting the reservoir to the intake port of the air pump by bypassing the collection container, and a discharge port of the air pump for coupling the reservoir to the air pump.
- Switching means for switching the flow path so as to be connected to any one of the bypass flow paths, and connecting the exhaust port of the air pump to an atmosphere release path when the storage body is connected to the bypass flow path;
- the case has an opening at the bottom, a packing is provided in the opening to hermetically contact the case with the inspection object, a filter is connected to the supply port, and the reference gas is supplied to the case. It is the outside air that has been purified at the Phil evening.
- the case is further sealed by pressing the case against the surface of the inspection object, and the gas to be inspected emitted from the inspection object is confined in the case. be able to. Then, the gas to be inspected collected in the case is mixed with the reference gas taken from the supply port and supplied to the collection container from the sampling port. Therefore, in the collection container, the gas to be inspected mixed with the reference gas only needs to be separated and detected, and the amount of gas emission per unit time of the inspection object to be investigated can be easily detected.
- the above-mentioned case has an open bottom and packing is attached to the periphery of the case, if the object to be inspected cannot be cut off as a test piece such as the floor or wall of an existing building, By tightly fitting the opening to the existing object to be inspected, such as a floor or wall, the inside of the case can be kept airtight through the packing around the opening. be able to. like this
- not only material inspection before construction, but also measurement of gas emission can be easily performed at any location even in existing buildings after construction.
- a capillary flow path is provided in the collection port to adjust the flow velocity of the gas mixed with the gas to be inspected collected from the case, when the gas inside the case is sucked from the collection port.
- excessive pressure reduction in the case can be prevented. Therefore, it is possible to prevent the outside air from entering the case from the periphery of the case, and to prevent the inspection target gas from being forcibly diffused from the inspection target due to excessive decompression, thereby improving the inspection accuracy. Can be increased.
- a collection port connected to the introduction flow path for introducing the gas in the case into the collection container; and an inflatable and airtight internal pressure maintenance bag provided in the case.
- a pressure introduction passage connected to the internal pressure maintaining bag through the case, and for introducing a pressure adjusting gas to the internal pressure maintaining bag for inflating the internal pressure maintaining bag as the internal pressure of the case decreases. May be configured.
- the case has an opening at the bottom, and the opening is provided with a packing for hermetically sealing the case to the test object.
- the case is a chamber for accommodating the inspection material piece to be inspected.
- the case is formed of a transparent material.
- Stirring means is provided in the case, and the stirring means stirs the gas in the case.
- the pressure adjusting gas is introduced into the internal pressure maintaining bag from the pressure introducing path by a pressure reducing action in the case.
- Port opening / closing means for opening and closing between the sampling port and the introduction flow path is provided, and pressure introduction opening / closing means for opening and closing the pressure introduction path is provided in the pressure introduction path.
- An inflatable and airtight volume changing bag provided in the case; and a volume changing bag penetrating through the case and connected to the volume changing bag.
- a gas supply / discharge path for supplying / discharging gas for volume adjustment was provided to the volume change bag in order to change the volume of the gas.
- At least one of the internal pressure maintaining bag and the volume changing bag is provided in plural in the case.
- a gas supply / discharge opening / closing means for opening / closing the gas supply / discharge path is provided in the gas supply / discharge path.
- An adjusting gas container filled with the pressure adjusting gas or the volume adjusting gas is connected to at least one of the pressure introduction path and the gas supply / discharge path, and these gases are discharged from the adjusting gas container. Supplied.
- the gas collecting device is a gas collecting device, which covers an inspection target space in an airtight state from the outside and encloses a gas to be inspected which is radiated from the inspection target sealed therein.
- a reservoir functioning as a volume meter for storing the gas discharged from the reservoir, a drying unit provided between the reservoir and the collection container, for drying the gas, and an internal pressure of the reservoir.
- a switching means for connecting the exhaust port of the air pump to an open-to-atmosphere path when the reservoir is connected to the bypass flow path, and provided in the case.
- a pressure-retaining and airtight internal pressure maintenance bag which is connected to the internal pressure maintenance bag through the case, and the internal pressure is maintained as the internal pressure of the case decreases.
- the pressure guide for introducing a pressure regulating gas to to inflate the use bag An inlet, an inflatable and airtight volume changing bag provided in the case, and a volume changing bag penetrating the case and connected to the volume changing bag.
- a gas supply / discharge path for supplying / discharging a volume adjusting gas to / from the volume changing bag to change the volume in the case by contracting.
- an inflatable internal pressure maintaining bag is further provided in a case that covers the inspection target in an airtight state, and the pressure adjusting gas is provided in the internal pressure maintaining bag. Therefore, if a certain amount of gas is collected from the case to measure the concentration of the gas to be inspected, the pressure in the airtight case will be reduced according to the amount of gas collected. Due to the depressurizing action, the pressure maintaining bag is inflated by introducing the pressure adjusting gas by a volume corresponding to the sampling amount, and the pressure inside the case can be kept constant.
- the pressure adjusting gas is not mixed with the gas containing the gas to be inspected in the case by the airtight internal pressure maintaining bag, the gas to be inspected to be collected is not diluted. Therefore, the measurement accuracy can be improved by increasing the concentration of the gas to be inspected.
- a volume changing bag is provided in addition to the internal pressure maintaining bag, by inflating the volume changing bag in the case in advance, it is possible to prepare many types of cases having different volumes without replacing the case.
- the actual volume in the case can be changed. For this reason, if the amount of gas to be inspected from the inspection object is small and the gas concentration in the case does not reach a measurable gas concentration unless left for a long time, the variable volume bag is inflated to expand the actual volume in the case.
- the gas flow rate By adjusting the gas flow rate to a small value, a high concentration of gas can be created in the case in a short time even with a small amount of gas emission.
- the other internal pressure maintenance bag expands following the removal of gas from the case, so that the air pressure inside the case is kept constant. Can be maintained.
- the gas collecting device covers the inspection target space from the outside in an airtight state.
- the other end is connected to one of the gas circulation ports of the case, and an introduction flow path for introducing the gas into the collection container; and one end is connected to the collection container and the other end is a suction port of the air pump.
- a suction passage connected to a port for guiding the gas in the collection container to the air pump; and a suction passage provided between an exhaust port of the air pump and the other gas circulation port of the case.
- a buffer for buffering the gas pressure while temporarily storing the gas discharged from the air pump and circulating the gas again to the case; and a buffer provided between the buffer and the collection container, for circulating the gas.
- humidity adjusting means for adjusting the humidity to a constant.
- the case has an opening at the bottom, and the opening is provided with a packing for hermetically sealing the case to the test object.
- the case is a chamber for accommodating the inspection material piece to be inspected.
- the case is formed of a transparent material.
- the buffer is a bag that can expand and contract according to the difference between the pressure of the gas stored therein and the atmospheric pressure.
- the humidity adjusting means is a container filled with a humidity adjusting liquid for adjusting the humidity of the gas.
- the humidity adjusting liquid is an aqueous salt solution.
- a plurality of the collecting containers are provided in parallel, and the case is selectively connected to any one of the collecting containers between the collecting container and one of the gas circulation ports of the case.
- Switching means is provided for switching.
- the switching means switches the communication between each of the plurality of collection containers and the case over time.
- the switching operation of the switching means is controlled by the timer.
- the air pump is portable and is powered by a portable battery.
- the collection container is formed of a transparent material, is used as a colorimetric tube, and is used as a reaction tube into which reagents that react with the gas to be inspected are injected.
- the collection container is formed in a cylindrical shape, and its opening is closed with a cap.
- the introduction flow path and the suction flow path each have an injection needle-shaped tube, and these tubes are It is inserted into the collection container through the cap.
- At least a portion of the cap covering the opening of the collection container was covered with an insulating layer made of a material that does not affect the collection liquid.
- the reagents are contained in the trapping vessel.
- the AHMT reagents were prepared using the HC 1 0 4 quantitatively injected left for a predetermined time, the other was adjusted to the indicated value to set Bok the standard color solution to the absorbance meter reaches a predetermined value, then the capturing was added quantifying KI 0 4 reagents as the reagents in collecting vessel, the the collecting vessel was set Bok to the absorption spectrometer detects the formaldehyde concentration from which the indicated value.
- a fixed amount of a 2N-KNO solution is injected into the collection container as the collection liquid, and the gas including the gas to be inspected is passed through the collection container, and then the reagents are contained in the collection container.
- AHMT reagent is injected in a fixed amount and left for a predetermined period of time.
- the standard color solution is set in an absorptiometer so that the indicated value is adjusted to a predetermined value. of I 0 4 reagent quantified added, the the collecting vessel was set to the absorbance meter, detects the formaldehyde concentration from which the indicated value.
- the gas collecting device is provided with: a case for covering the inspection target space in an airtight state from the outside and enclosing the inspection target gas radiated from the inspection target enclosed therein; and a case provided in the case.
- a pair of gas circulation ports for circulating gas, an air pump for sucking the gas containing the test gas from the test space in the case, and a trap for collecting the test gas from the gas A collection vessel into which the collected liquid has been injected, and an introduction port having one end connected to the collection vessel and the other end connected to one of the gas circulation ports of the case to introduce the gas into the collection vessel.
- a flow path a suction path having one end connected to the collection container and the other end connected to an intake port of the air pump, and guiding the gas in the collection container to the air pump;
- a gas pressure buffer is provided between the air port and the other gas circulation port of the case, and temporarily stores the gas discharged from the air pump and circulates and supplies the gas to the case again.
- a buffer provided between the buffer and the collection container, and humidity adjusting means for constantly adjusting the humidity of the circulated gas, wherein the case has an opening at a bottom portion; Is provided with a packing for hermetically sealing the case to the test object.
- the collection container is formed of a transparent material, is used as a colorimetric tube, and contains reagents that react with the test gas.
- the buffer is a bag capable of expanding and contracting according to the difference between the pressure of the gas stored in the buffer and the atmospheric pressure, and the humidity adjusting means is used as the reaction tube.
- This is a container into which a humidity control solution prepared with a saline solution for adjusting humidity is injected.
- the gas trapping device according to the present invention is a test in which a test target space is covered in an airtight state from the outside and sealed inside the test target space.
- An air pump that sucks the gas, a collection container into which a collection liquid that collects the gas to be inspected from the gas is connected, and one end is connected to the collection container and the other end is one of the cases.
- An introduction flow path connected to the gas circulation port for introducing the gas into the collection container; one end connected to the collection container and the other end connected to the suction port of the air pump;
- a suction flow passage for guiding the gas in the collection container to the air pump; and a suction passage provided between an exhaust port of the air pump and the other gas circulation port of the case, and discharged from the air pump.
- a buffer for buffering the gas pressure while temporarily storing and circulating the gas to the case again, and provided between the buffer and the collection vessel to keep the humidity of the circulated gas constant.
- the case has an opening at the bottom, and the opening is provided with a packing for hermetically sealing the case to the object to be inspected, and the buffer is stored therein.
- a bag capable of inflating and contracting according to the difference between the pressure of the gas and the atmospheric pressure, wherein the humidity adjusting means is a container into which a humidity adjusting solution prepared with a saline solution for adjusting the humidity of the gas is injected.
- the said collecting container is formed of a transparent material as a colorimetric tube, and et al used as a reaction tube reagents that react with the test-sample gas is injected
- a plurality of the collecting containers are connected in parallel with each other between the collecting container and the gas circulation port of one of the cases. There is provided switching means for selectively switching.
- the gas is circulated around the case by simply pressing the case against the test object and driving the air pump, and the case is sealed at this time.
- the gas to be inspected collected inside the case is taken into the collection container.
- the gas sucked from the collection container, stored in the buffer, and returned to the case again is purified because the gas to be inspected is collected in the collection container, and the humidity is adjusted by humidity adjustment means. Is also kept constant.
- the gas to be inspected is collected by circulating the gas for a predetermined time in such a closed loop circuit, the gas to be inspected can be quantitatively analyzed in the collection container, and the inspection Gas can be collected.
- the gas can be circulated in the closed loop without pressure fluctuation by the buffer, and the occurrence of measurement error can be prevented with a simple configuration.
- FIG. 1 is an overall circuit diagram showing a gas collecting device according to a first embodiment of the present invention.
- FIG. 2 is an explanatory diagram of a switching cock provided in the gas collecting device shown in FIG. .
- FIG. 3 is a perspective view showing an assembled state of the gas collecting device shown in FIG.
- FIG. 4 is an enlarged sectional view of a cap used for an impinger of the gas trapping device according to the present invention.
- FIG. 5 is a graph comparing the storage state of the collected liquid injected into the impinger with a normal cap and the cap shown in FIG.
- FIG. 6 is an enlarged sectional view of a main part showing a modification of the cap shown in FIG.
- FIG. 7 is a circuit diagram of a pressure switch used in the gas trapping device according to the present invention.
- FIG. 8 is a sectional view showing the structure of the pressure switch shown in FIG.
- FIG. 9 is a sectional view showing an operation state of the pressure switch shown in FIG.
- FIG. 10 is a schematic view of a pressing switch body provided on the pressure switch shown in FIG.
- FIG. 11 is a perspective view showing a characteristic portion of a gas trapping device according to a second embodiment of the present invention.
- FIG. 12 is a graph showing the relationship between the length of the capillary tube used in the gas trapping device shown in FIG. 11 and the flow rate.
- FIG. 13 is a schematic configuration diagram showing a characteristic portion of a gas trapping device according to a third embodiment of the present invention.
- FIG. 14 is a schematic configuration diagram showing a modification of the gas trapping device shown in FIG.
- FIG. 15 is a schematic configuration diagram showing another modification of the gas trapping device shown in FIG.
- FIG. 16 is an overall circuit diagram showing a gas trapping device according to a fourth embodiment of the present invention.
- FIG. 17 is an overall circuit diagram showing a modification of the gas trapping device shown in FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- the first embodiment of the gas trapping device is basically a portable air pump 12 driven by a portable battery to suck a gas in a space to be inspected, and a gas to be inspected from the gas.
- a pin 24 one end of which is connected to the impinger 14, and the other end of which is connected to the inspection target space, and a pipe 24 serving as an introduction flow path for introducing the gas into the impinger 14;
- One end is connected to the air pump 12 and the other end is connected to the suction port 12 a of the air pump 12, and the pipe 26 serves as a suction flow path for guiding the gas in the impinger 14 to the air pump 12.
- a bag 18 serving as a storage body that is connected to an exhaust port 12 b of the air pump 12 and stores the gas discharged from the air pump 12 and functions as a volume meter;
- a desiccant tube 16 provided as a drying means for drying the gas, a pressure switch 30 for detecting the internal pressure of the bag 18, and the bag 18, provided between the impinger 14 and the impinger 14. 4 bypass above
- the pipe 36 as a bypass flow path connected to the intake port 12a of the air pump 12 and the bag 18 are connected to one of the exhaust port 12b and the pipe 36 of the air pump 12.
- the switching port as a switching means for connecting the exhaust port 12 b of the air pump 12 to the air release path 38 when the bag 18 is connected to the pipe 36.
- the air pump 12 and the battery are housed therein, and the outer surface thereof is provided with mounting surfaces 40 a and 40 b for mounting the desiccant tube 16 and the impinger 14.
- a main storage box 40 having: a mounting cock attached to the main storage box 40 for accommodating the switching cock 34 and the pressure switch 30 therein and detachably mounting the bag 18
- a sub-storage box 4 2 having a part 4 6
- the above-mentioned invoker 14 is formed of a transparent material, is used as a colorimetric tube, is used as a reaction tube into which reagents reacting with the above-mentioned gas to be inspected are injected, and the above-mentioned pressure switch 30 is provided. Detects that the internal pressure of the bag 18 has reached a predetermined pressure, and outputs a stop signal for the air pump 12. Further, the bag 18 is foldable and replaceable.
- the gas trapping device 10 of the present embodiment is of a type that sucks air, and includes a portable air pump 12 as shown in FIG. By sucking the atmosphere in the space, the gas to be inspected in the atmosphere is taken in.
- the air pump 12 is driven by a portable battery such as a dry battery (not shown) so that the air pump 12 is portable.
- a portable battery such as a dry battery (not shown) so that the air pump 12 is portable.
- an impinger 14 and a desiccant tube 16 which also serves as a filter are installed in order, and an air port 12 b of the air pump 12 is provided with a bag 18 for storing gas discharged therefrom.
- the bag 18 is used as a volume meter for measuring a gas amount.
- the impeller 14 is formed of a test tube and a bottomed cylindrical glass tube, and the upper end opening is closed by an elastic cap 22.
- the intake bin 14 has a pipe for air intake.
- a pipe 26 connecting the inside of the invoker 14 to the suction port 12a, and the pipe 24 and the pipe 26 are formed by injection-needle-shaped metal cavities, respectively.
- the respective needle-shaped tips 24 a and 26 a are inserted into the impeller 14. Inserted. Also, a predetermined amount of the collected liquid 28 is injected into the invincible 14, and the tip 24 a of the tube 24 is immersed in the collected liquid 28, and The tip 26 a is positioned above the liquid level of the collected liquid 28.
- a pressure switch 30 is provided between the air pump 12 and the bag 18. The pressure in the bag 18 is detected by the pressure switch 30, and when the bag 18 is filled with air. The air pump 12 is stopped.
- a switching pipe 34 is provided in an exhaust pipe 32 communicating with the bag 18 on the downstream side of the pressure switch 30.
- the switching cock 34 connects the bag 18 to the exhaust pipe 32 of the air pump 12 at the normal position shown in FIG. 2 (a), while the bag 18 at the switching position shown in FIG. 2 (b).
- the exhaust pipe 32 communicates with the open-to-atmosphere path 38.
- the gas collecting device 10 having the above configuration is assembled as a compact structure as shown in FIG. That is, a sub-storage box 4 for storing the switching cock 34, the pressure switch 30, etc., is provided on a side surface 40a on the front side of the main storage box 40 for storing the air pump 12 and a dry battery serving as a driving source. 2 is installed with approximately half the space.
- the side 4 2 a on the front side of the sub-storage box 4 2 has a lever 4 of the switching cock 3 4 4, and a mounting portion 46 for the bag 18 is provided on a lateral side surface 42b.
- two desiccant tubes 16 are attached to the side surface 40 b of the main storage box 40, and the near side surface 40 a of the main storage box 40 is provided with:
- An impinger 14 is mounted on the side of the sub-storage box 42.
- the gas collecting device 10 is formed to have a size of about 10 cm in depth, 12 cm in width and 18 cm in height.
- the air at the measurement location is taken into the impinger 14 from the pipe 24 by driving the air pump 12, and the collected liquid of the impinger 14 is collected. After bubbling through 28, it passes through the desiccant tube 16 and is sucked into the air pump 12.
- the gas discharged from the air pump 12 is stored in the bag 18.
- the bag 18 is used as a volume meter, and when the bag 18 is filled, the pressure switch 30 is operated to stop the air pump 12, and the operation of collecting the gas to be inspected is completed.
- the gas to be inspected in the atmosphere is mixed into the collected liquid 28 of the inbinger 14, and the inbinjar 14 can be inspected as a reaction vessel and a colorimetric tube.
- the switching cock 34 is set to the switching position shown in FIG. 2 (b), whereby the bag 18 is connected to the intake port 12a of the air pump 12. Therefore, the gas in the bag 18 is sucked by the air pump 12 and automatically discharged, and the bag 18 can be emptied to prepare for the next collection.
- the bag 18 is used instead of the gas volume meter, and the bag 18 may be a plastic bag-like container. Therefore, since the bag 18 can be folded and carried, it is extremely lightweight, and the bag 18 can be externally attached, and the suction amount can be arbitrarily changed by changing the size of the bag 18. .
- the pressure switch 30 can be constituted by a microswitch, a rubber pressure receiving portion, a plastic pipe, or the like.
- the pressure is increased.
- the microswitch operates can be obtained. Therefore, since the amount of one suction is determined by the capacity of the bag 18, it is possible to read the gas volume meter and check the scale as in the conventional case. No switch operation is required. For this reason, the gas volume meter is conventionally configured as a precision instrument, which is expensive and requires careful handling. However, in the present embodiment, such consideration is not required at all.
- the bag 18 is available in various sizes as gas containers used for gas analysis, the volume can be measured in advance and used.
- the switching cock 34 built in the air pump 12
- the flow path of the air pump 12 is reversed, and the gas in the bag 18 can be automatically discharged with the bag 18 attached. Therefore, the operability and workability are excellent, and in particular, the switching cock 34 is changed to a modified four-way cock made of, for example, a polyethylene three-way cock so that the switching of the flow path can be performed by one switching operation. One evening can be done in Tsuchi.
- the switching cock 34 is interlocked with a speed adjusting switch (not shown) for changing the driving voltage of the air pump 12. In this way, the air pump 12 is driven.
- the concentration rate of the gas component of the gas to be inspected in the collected liquid 28 collected by the impinger 14 is determined by the ratio between the collected liquid amount and the suctioned atmospheric amount.
- the impinger 14 has been miniaturized so that it can be concentrated and collected with a small amount of collected liquid 28 (1 to 3 ml). For this reason, a high concentration can be obtained even if the amount of air suction is small, so that the capacity of the bag 18 may be as small as 1 to 5 liters.
- the bin bin 14 can be used as it is as a reaction vessel and a colorimetric tube, the collected liquid 28 can be transferred or a part of the collected liquid 28 can be analyzed.
- colorimetric analysis means that a reagent is added to a solution that captures the gas to be inspected, a specific color is developed by a chemical reaction, and the concentration of the color is measured by transmission of light to determine the gas component. This is an analytical method for quantifying the concentration.
- a commercially available small glass test tube can be used for the impinger 14, and it is easier to handle and extremely inexpensive than a conventional impinger.
- An elastic cap 22 is attached to the above-mentioned invincible 14, and a large injection needle-shaped metal cavity is used for the pipes 24 and 26 to be attached to the elastic caps 22. 2 Just insert it into 2 to secure the air flow path. Can be maintained. Since the above-mentioned bin 14 can be operated with the elastic cap 22 attached, there is no danger that the collected liquid 28 will spill even if the bin 14 is accidentally knocked down. In addition, the collection liquid 28 and the reagents for the reaction can be injected into the impinger 14 with a syringe with the elastic cap 22 attached, thereby improving operability and safety.
- the tube 24 and the tube 26 are configured as cavities, and have a small inner diameter, so that gas bubbles flowing out of the end of the tube 24 into the collection liquid 28 are reduced, and the solubility of gas components is improved. Thus, the collection efficiency is improved.
- the pressure in the injector 14 is slightly reduced, and the collected liquid 28 remaining in the pipe 24 is removed by the impinger. Since it is sucked into the tube 14, the tube 24 and the tube 26 do not need to be washed. In addition, contamination by residual liquid can be prevented.
- the tips of the pipes 24 and 26 are closed needles to facilitate the insertion into the elastic cap 22, and the communication opening of the gas is provided with side holes near the needle-like tips 24 a and 26 a. By providing the fin, it is possible to prevent blockage due to rubber dust.
- the tube 24 formed as a metal capillary also functions as a gas flow resistance tube, so that the gas flow rate is stabilized. For this reason, the gas flow rate (flow velocity) is appropriately controlled, the collection rate of the gas to be inspected is made constant, and the inspection accuracy of the gas to be inspected can be improved.
- the flow rate can be controlled with almost no influence of the capacity of the air pump 12, and the flow rate can be stabilized. Necessary monitoring with an instantaneous flow meter and the need for a double valve can be eliminated, and collection work can be performed without worrying about flow rate adjustment.
- the tube 24 and the tube 26 are disclosed as being formed as metal cavities, the invention is not limited to this, and they can be formed as glass or plastic cavities.
- the gas collecting device 10 of the present embodiment is provided with the intake port 12 a of the portable air pump 12, the inlet 14 and the desiccant tube 16, and the exhaust port 12 b with the bag 1.
- these components can be assembled into a compact as a whole and assembled as shown in FIG. Therefore, the gas collecting device 10 assembled in this manner is portable and portable.
- the handling is simplified and can be used by anyone without requiring skill.
- the height can be easily adjusted by setting it on a camera tripod, etc., and it does not take up space. Therefore, the configuration of the gas collecting device 10 is remarkably simplified, and it is possible to reduce the size and cost.
- an elastic cap 22 for closing the upper end opening 14a of the above-mentioned impeller 14 is formed of synthetic rubber, and at least the impinger 14 of the elastic cap 22 formed of this synthetic rubber is used.
- the portion inserted into the interior covering the upper end opening portion 14a of the substrate is covered with an insulating film 48 formed of a material that does not affect the collection liquid 28. That is, in the elastic cap 22, substantially the lower half of the bottom surface 22 a and the side surface 22 b is inserted into the impinger 14, and the bottom surface 22 a and the side surface
- the insulating film 48 is integrally coated or pasted as a thin film layer so as to cover the entire 2b.
- the insulating film 48 is not limited to the bottom surface 22a and the side surface 22b of the elastic cap 22, but may cover the entire surface including the top surface 22c.
- a soft material having appropriate elasticity is selected so that the insulating film 48 itself does not affect the collection liquid 28 and does not impair the airtightness of the elastic cap 22.
- Resin materials such as polyethylene, vinylidene chloride resin, fluorine resin, and vinyl chloride, and metal foil such as tin are used.
- the elastic cap 22 of the impinger 14 used as the colorimetric tube has a bottom surface 22 a and a side surface 22 b inserted into the upper end opening 14 a of the impinger 14 covered with an insulating film 48. Therefore, the insulating film 48 can prevent gas components generated from the elastic cap 22 from entering the inside of the injector 14. For this reason, even if the collected liquid 28 has been injected into the above-mentioned inbinger 14 in advance before the analysis of the gas to be inspected, the gas component generated in the elastic cap 22 does not contain the collected liquid 28. Therefore, the collection liquid 28 can be stored for a long time in a state in which the collection liquid 28 has been previously injected into the bin 14.
- FIG. 5 shows an impinger fitted with a normal elastic cap and the insulating film 4 of the present embodiment.
- the graph shows the change in the formaldehyde concentration when the collected liquid 28 is injected and stored in the impinger 14 equipped with the elastic cap 22 having the characteristic cap A2, respectively.
- the characteristic in which the impinger is closed by only the elastic cap is shown, and the characteristic B shows the characteristic of the present embodiment in which the impinger 14 is closed by the elastic cap 22 provided with the insulating film 48.
- this graph was obtained by examining the effect of the elastic cap on the collected liquid 28 in a state where gas was not collected.
- any gas component generated from the non-volatile cap affected the collected liquid 28 with the passage of time, and it was as if formaldehyde was sucked.
- the concentration is increased almost proportionally (approximately 0.04 ppm on the eighth day).
- the progress 6 is peaked (approximately 0.0025 ppm) and the 3 is increased in the impulse 14 using the elastic cap 22 provided with the insulating film 48.
- a slight increase was observed between the first and eighth days, but it also disappeared on the eighth day, indicating that the gas component generated from the elastic cap 22 had little effect on the collected liquid 28. Is done.
- the gas analysis can be performed for a long period of time after the collection liquid 28 has been injected into the injector 14 in advance. At this time, it is only necessary to attach an invaginator 14 containing a collection liquid 28 prepared in advance to the gas collection device 10. This greatly simplifies and speeds up the analytical work. In addition, since long-term storage is possible, the collection liquid 28 can be distributed while being injected into the bin 14, and the impinger 14 and the collection liquid 28 are sold separately. However, the product value can be greatly improved.
- the insulating film 48 is not limited to coating or pasting, but may be formed as an independent sheet as shown in FIG.
- the insulating film 48a is formed to be large enough to cover the bottom surface 22a and the side surface 22b of the elastic cap 22, and the center of the insulating film 48a is opened at the upper end of the After covering the portion 14a, the elastic cap 22 is pressed into the upper end opening 14a so as to press the insulating film 48a. Even in this case, the portion where the elastic cap 22 is inserted to cover the upper end opening 14a of the impinger 14 is covered with the insulating film 48a, and the elastic cap is inserted. 2 2 can be cut off from the inside of the insider 14.
- FIG. 7 shows the vicinity of the connection between the air pump 12 and the back 18.
- the pressure switch 30 is interposed between the air pump 12 and the bag 18 and extends from an intermediate portion of the exhaust pipe 32 through which the gas stored in the bag 18 flows from the air pump 12. It is connected to the branch portion 32a, and is provided so as to operate by sensing the pressure inside the back 18.
- the gas collecting device 10 is provided with a buzzer 50.
- the pressure switch 30 is provided with a buzzer 50 and an air pump 12, and a power source 5 for supplying operating power to the buzzer 50 and the air pump 12.
- the buzzer 50 and the air pump 12 are ON / OFF controlled between the buzzer 50 and the air pump 12.
- the pressure switch 30 is connected to the power supply line 54 extending from the power supply 52 and to the power supply 52 again via the buzzer 50 and the air pump 12 extending from the switch 30.
- the buzzer-side line 56 and the air pump-side line 58 are connected to the power line 54 and the buzzer-side line 56 and the air pump-side line 58 are electrically connected and opened. I'm sorry.
- the pressure switch 30 is mainly disposed in an outer case 60 as a guide formed into a hollow cylindrical body and in an upper inside portion of the outer case 60.
- the extension member 62 is provided, and a switch body 64 of a pressing type disposed at a lower portion inside the outer case 60.
- the extension member 62 is a bag-shaped container having a reverse bell shape formed so as to be expandable and contractable with a flexible material such as a rubber film, for example, a commercially available medical finger cot or the like. And a housing portion 62a capable of air-tightly storing gas therein.
- the peripheral edge of the upper end opening of the extension member 62 is in a close contact state between the upper opening end 60a of the outer case 60 and the rubber stopper 66 closed and housed inside the outer case 60. It is interposed and locked.
- the plug 66 is provided with a gas introduction pipe 68 penetrating through the center thereof.
- a branch portion 32 a of the exhaust pipe 32 is connected to a distal end portion of the gas introduction pipe 68, and communicates the housing portion 62 a of the extension member 62 with the inside of the bag 18, Gas is introduced into the container 6 2 a ing.
- the extension member 62 is in a state of being entirely bent as shown in FIG. 8, and is extended through the gas introduction pipe 68.
- the gas is introduced into the accommodating portion 62a, it expands as shown in FIG. 9 to increase the volume and the outer shape. Then, when the gas in the storage part 62 a disappears, the state returns to the original radius state again.
- the outer case 60 is provided so as to surround the peripheral side of the extension member 62. That is, when the extension member 62 expands, the outer case 60 restricts the expansion member 62 from the side by the inner wall 60b, while suppressing the expansion in the axial direction, here, the downward direction. Is tolerated. As a result, the extension member 62 expands while being guided by the inner wall 60 b of the outer case 60 toward the switch body 64 of the pressing type.
- a communication hole 70 is formed in the inner wall 60 b of the outer case 60 to secure communication with the outside, and the outer case 60 is formed according to the expansion and contraction of the extension member 62. The air interposed between the extension member 62 and the extension member 62 is supplied and discharged to the outside through the communication hole 70.
- the press-type switch body 64 is fixed via a rubber mounting member 72 housed inside the lower portion of the outer case 60 in close contact with the inner periphery thereof.
- the switch body 64 includes an operation unit 74 provided on the inner surface of the outer case 60 toward the extension member 62 and two or more than three operating units provided on the outer surface of the outer case 60. And a terminal 76.
- the operating section 74 is urged to the outside of the switch body 64 by a biasing member such as a spring or a spring (not shown) built in the switch body 64, and is shown in FIG. 9 when pressed. In this way, the switch body 64 is pushed into the switch body 64, and when the switch is released, it returns to the original position.
- An operating element 78 for transmitting the expansion force of the extending member 62 to the operating section 74 of the switch body 64 is provided between the operating section 74 and the extending member 62.
- This actuator 78 is constructed by connecting upper and lower two plate members 78 a and 78 b via a hinge portion 78 c so as to be expandable and contractible, and has a lower end portion of the switch body 64. It is connected to the vicinity of the operation section 74 via a hinge section 78d, and an upper plate member 78a is provided in contact with the outer bottom surface of the extension member 62. The actuator 78 is contracted downward by the bulging of the extension member 62 via the hinge portion 78c.
- the lower plate member 78b comes into contact with and presses the operation section 74.
- the operation portion 74 is released from the pressing, and is pushed outward by the urging force of the urging member built in the switch body 64.
- the lower plate member 78 b of the actuator 78 is brought into contact with and pressed against the lower plate member 78 b to extend the actuator 78.
- the extension member 62 is pushed back in the contracting direction, the outer shape is reduced, and the original state is restored.
- the operation unit 74 is pressed or opened according to the expansion and contraction of the extension member 62.
- the terminals 76 of the switch body 64 are electrically connected to each other or opened in response to the pressing or opening of the operation unit 74 in this manner. That is, as shown in FIG. 10, the switch configuration of the switch body 64 is such that one of the plurality of terminals 76 is a common terminal 76a, and the common terminal 76a is A so-called switching switch configuration in which two of the terminals 76 are selectively connected as switching terminals 76 b, and when the operating section 74 is pressed, the switching terminal 76 While one of b is connected to the common terminal 76a and the other is opened, when the operation unit 74 is opened, the other of the switching terminals 76b is connected to the common terminal 76a and one is opened .
- a switch body 64 it is preferable to use a commonly sold microswitch.
- a common terminal 76 a is connected to the power supply line 54, and each switching terminal 76 b is connected to the buzzer side line 56 and the air pump side line 58, respectively.
- the operation member 74 of the switch body 64 is pressed by the expansion of the extension member 62 to connect or open two or more terminals 76. Simplifies the configuration and facilitates cost reduction and miniaturization be able to. Further, since the expansion of the extension member 62 is guided by the outer case 60, even if the pressure to be sensed is weak as in the case of being applied to the gas collecting device 10, it can be sufficiently sensed. . Further, since a commercially available microswitch can be used as the switch body 64, high durability and high reliability can be obtained, and the switch body 64 has another switch configuration. By replacing with, the switching function of the switch can be easily changed, achieving versatility and high versatility. The pressure at which the pressure switch 30 operates can be easily changed by appropriately selecting the switch body 64 from, for example, the biasing force of a biasing member.
- the extension member 62 has an inverted bell shape, but may have another shape.
- the second embodiment of the gas collecting apparatus basically covers the space to be inspected in an airtight state from the outside, and the gas to be inspected radiated from the inspection object 80 sealed therein. 82, a sampling port provided in the case 82 for collecting the gas in the case 82 containing the gas to be inspected, and the inspection in the case 82 described above.
- An air pump 12 that sucks the gas from the target space and a case 82 that is provided in the case 82 and supplies a reference gas into the case 82 according to the suction of the gas in the case 82 by the air pump 12.
- an intake bin 14 as a collection container into which a collection liquid 28 for collecting the gas to be inspected from the above-mentioned gas, and one end connected to the above-mentioned intake bin 14 and the other end Is connected to the sampling port 84 above One end is connected to the impinger 14 and the other end is connected to the intake port 12 a of the air pump 12.
- a pipe 26 serving as a suction flow path for guiding the gas in the impinger 14 to the air pump 12 and an exhaust port 12 b of the air pump 12 are connected to be discharged from the air pump 12.
- a bag 18 that stores the gas and functions as a volume meter and is provided between the collection port 84 and the bag 18 to reduce the flow rate of the gas to be sucked.
- a desiccant tube 16 provided as a drying channel for drying gas is provided between the bag 18 and the invoker 14, and a capillary tube 88 serving as a capillary channel.
- the flow path is switched so that the pipe 36 and the bag 18 are connected to one of the exhaust port 12 b of the air pump 12 and the pipe 36, and the bag 18 is connected to the pipe 18.
- a switching port 34 as a switching means for connecting the exhaust port 1 2b of the air pump 12 to the air release path 38 when connected to 36, and the case 82 is open at the bottom.
- the opening 82a is provided with a packing 90 for hermetically sealing the case 82 to the inspection object 80, and a filter 92 is connected to the supply port 86.
- the configuration that the reference gas is the outside air purified by the filter 92 Eteiru.
- the second embodiment is of a type in which the gas in the case 82 is sucked while supplying the reference gas to the inspection target space sealed in the case 82, and the downstream configuration from the impinger 14 is the same as the first embodiment.
- the configuration is the same as that of the embodiment, and the configuration on the upstream side of the invoker 14 is characteristic. Therefore, only this characteristic portion will be described.
- the gas collecting device 10a of the present embodiment includes a case 82 formed of a transparent material into a hemispherical shape having a predetermined thickness, and the case 82 is used as a reference gas.
- a supply port 86 for taking the purified air into the case 82, and a gas collection device 10 for supplying the gas mixed with the gas to be inspected in the case 82 to the gas collection device 10 shown in Fig. 1. 1 and 8 are provided to face each other.
- the air pump 12 forcibly sucks the gas in the case 82.
- a packing 90 made of soft rubber or the like is attached to the periphery of the opening 82 a of the case 82, and the opening 82 a is pressed against the surface of the inspection object 80 via the packing 90.
- a capillary tube 88 wound spirally as a resistance tube is connected to the sampling port 84, and the capillary tube 88 reduces the flow rate of gas by suction of the air pump 12 to a low speed. It is designed to suppress.
- the purified air introduced into the case 82 from the supply port 86 is obtained by purifying the outside air through a catalyst filled in the filter 92.
- activated carbon, porous polymer beads, molecular sieves, chemical filters, etc. are appropriately selected as the catalyst to be filled in the filter 92 according to the type of gas to be inspected. Used.
- a reference gas container filled with purified air used as a reference gas or nitrogen gas that can be used as a reference gas is used.
- the bag 94 can be connected to the supply port 86, and the reference gas in the bag 94 can be taken into the case 82.
- the gas trapping device 1 Oa of the present embodiment is configured such that the capillary tube 88 connected to the sampling port 84 of the case 82 is connected to the tube 24 of FIG.
- the opening 82 a of the case 82 is pressed against the inspection site of the inspection object 80, while the supply port 86 of the case 82 is connected to the filter 92.
- the soft packing 90 is provided in the opening 82 a of the case 82, when the opening 82 a is pressed against the surface of the inspection object 80, the packing 90 forms the soft packing 90.
- Enclosure 8 2a can be sealed.
- the case 82 is formed to be transparent, when the case 82 is pressed against the inspection object 8 °, it is easy to confirm the installation status and easily observe the state of the surface of the inspection object 80. Can be.
- the air purified by the filter 92 from the supply port 86 is supplied from the supply port 86 as much as the sucked gas. 8 It is taken in 2.
- the inspection target gas emitted from the inspection target 80 is collected in the sealed case 82, and the collected inspection target gas is mixed with the purified air taken in from the supply port 86.
- the air is sucked into the air pump 12 from the sampling port 84.
- the gas sucked by the air pump 12 for a predetermined time is stored in the bag 18, and the inspection target gas contained in the collected gas is quantitatively analyzed by a chemical method using the injector 14. .
- a cavity tube 88 is connected to the sampling port 84 of the case 82, and a resistance is added to the flow of the gas sucked into the air pump 12 from the inside of the case 82 to increase the flow rate. Since the pressure inside the case 82 is sucked from the sampling port 84, the negative pressure in the case 82 can be prevented from becoming excessively high. Therefore, although the packing 90 is provided around the periphery of the opening 82 a of the case 82 and the case 82 is sealed, it is possible to prevent the outside air from entering the case 82 from the sealed portion due to excessive negative pressure. In addition, it is possible to prevent the gas to be inspected from being forcibly dissipated by the invasion of the outside air in this way, and it is possible to enhance the analysis accuracy.
- the flow rate of the air can be arbitrarily set at a low speed and stably by appropriately selecting the inner diameter and length of the tube as shown in FIG. 12.
- Fig. 12 shows the measurement results of the relationship between length and flow rate when a tube made of polytetrafluorocarbon (trade name: Teflon) was used as the capillary tube 88.
- the capillary tube 88 is connected to the sampling port 84
- the invention is not limited to this, and there is a possibility that a gas to be inspected may be adsorbed inside the capillary tube 88 to cause a measurement error.
- the capillary tube 88 may be connected to the downstream side of the air pump 12.
- the gas collecting apparatus 10a of the present embodiment can collect and inspect the gas to be inspected by simply pressing the case 82 against the surface of the object to be inspected 80. There is no need to cut the specimen from zero. For this reason, it is possible to easily measure the emission amount of the gas to be inspected at an arbitrary location even in an existing building after the construction, in addition to the material inspection before the construction.
- building materials are often used in combination of different materials.
- measurement in the actual construction state is performed. This will be extremely useful for investigating gas emission phenomena.
- the measurement of harmful gas concentration in a building was detected only as an average concentration in a large space, but by using the gas trapping device 10a of this embodiment, It is possible to investigate the amount of gas per unit area released from various materials. This makes it easier to consider measures to prevent harmful gas emissions.
- the third embodiment of the gas trapping device basically covers the inspection target space from the outside in an airtight state, and the inspection target gas radiated from the inspection target 80 sealed therein.
- a collection port 98 provided in the case 96 for collecting the gas in the case 96 containing the gas to be inspected, and a case 96 in the above case 96.
- the end is connected to the intake port 1 2a of the air pump 1 2
- the air pump 12 is connected to a pipe 26 serving as a suction flow path for guiding the gas in the impinger 14 to the air pump 12 and an exhaust port 12 b of the air pump 12, and is discharged from the air pump 12.
- a bag 18 as a storage body that functions as a volume meter for storing the gas to be collected, and a drying device that is provided between the bag 18 and the impinger 14 and that serves as drying means for drying the gas.
- the agent tube 16, the pressure switch 30 for detecting the internal pressure of the bag 18, and the bag 18, the intake port 12 a of the air pump 12 bypassing the invoker 14 The flow path is switched so that the pipe 36 as a bypass flow path connected to the air pump and the bag 18 are connected to one of the exhaust port 12 b of the air pump 12 and one of the pipe 36.
- a switching cock 34 serving as switching means for connecting the exhaust port 12 b of the air pump 12 to the open-to-atmosphere path 38, and having expandable and contractible and airtightness provided in the case 96.
- a first envelope 100 as a bag for maintaining the internal pressure is connected to the first envelope 100 through the case 96, and the first envelope 100 is connected to the first envelope 100 as the internal pressure of the case 96 decreases.
- a tube 102 as a pressure introduction passage for introducing a pressure adjusting gas into the case 96 for inflation, and a second volume as a self-expanding and airtight volume changing bag provided in the case 96.
- the second envelope 104 passes through the case 96 and is connected to the second envelope 104 to expand and contract the second envelope 104 to change the volume in the case 96.
- the third embodiment is a type in which the gas in the case 96 is sucked while maintaining the pressure of the inspection space sealed in the case 96, and the present embodiment is similar to the second embodiment in that the Since the configuration on the downstream side is the same as that of the first embodiment described above, and the configuration on the upstream side from the invoker 14 is characteristic, only this characteristic portion will be described.
- Fig. 13 shows the case where only the first envelope 1.0 is provided
- Fig. 14 shows the case where the second envelope 104 is used together. ing.
- the gas collecting device 1 Ob of the present embodiment includes a case 96 that covers the inspection target 80 in an airtight state and collects the inspection target gas emitted from the inspection target 80.
- the gas mixed with the gas to be inspected in the case 96 is supplied to the gas collecting device 10 having the structure shown in FIG. 1, and the gas to be inspected is analyzed from the gas. .
- the case 96 is configured as a chamber having a closed structure as shown in FIG. 13 so that an inspection object 80 such as a plywood piece, which is an inspection material piece, is accommodated in the chamber 96 in the form of a chamber. Has become.
- the case 96 is provided with an internal gas sampling port 98, and the sampling port 98 is provided with an opening / closing cock 108 as a port opening / closing means.
- An inflatable first envelope 100 is provided inside the case 96, and the atmosphere outside the case 96 is freely introduced into the first envelope 100 via a pipe 102. .
- the first envelope 100 is desirably formed of a flexible thin film having a high degree of flexibility, and is formed so as to have extremely low resistance when the first envelope 100 expands.
- the pipe 102 communicating with the first envelope 100 is fitted through the top plate of the case 96 in an airtight manner, and serves as a closing means for introducing pressure of the pipe 102. By opening the cock 110, the outside air can be freely taken into the first envelope 100.
- a stirrer 112 is attached to a side surface inside the case 96 as a stirring means at a portion not obstructing the first envelope 100 when the above-mentioned first envelope 100 expands.
- the gas in Case 96 is agitated, and the gas to be inspected that is emitted is mixed uniformly.
- the operation of collecting the gas to be inspected by the gas collecting device 10 b. Is the same as in the first embodiment described above.
- the gas in the case 96 is sucked by the air pump 12, and
- the gas to be inspected is collected by the impinger 14 and the gas discharged from the air pump 12 is stored in a bag 18 functioning as a volume meter.
- the amount of gas to be inspected is determined as follows. After the first gas sampling is performed by the above gas collecting device 10b, the elapse of a predetermined time is measured, and after the predetermined time, the next gas sampling and gas concentration measurement are performed. Find the amount of target gas generated.
- T Elapsed time from the first sampling to the second sampling
- the concentration measurement by gas sampling is repeated every arbitrary time. Therefore, it is also possible to track changes in gas concentration and gas generation in Case 96 with time.
- a closed case 96 is used to collect the gas to be inspected emitted from the inspection object 80.
- An inflatable first envelope 100 is provided therein so that the atmosphere outside the case 96 can be introduced into the first envelope 100. Therefore, the gas to be inspected emitted from the inspection object 80 is confined in the case 96, and the amount of the gas to be inspected increases with the passage of time and the concentration of the gas to be inspected in the case 96 increases.
- the gas containing the gas to be inspected in the case 96 flows from the sampling port 98 to the impinger 14. Is sucked into.
- the inside of the closed case 96 is decompressed in accordance with the amount of gas sucked in.
- the first envelope 100 described above is reduced in volume by a volume corresponding to the amount of suction. External air is introduced from 2 and expands. For this reason, in the case 96, the decompressed amount is offset by the expansion of the first end loop 100, and the pressure in the case 96 can be kept constant.
- the test target gas to be collected since the air introduced from the outside stays in the first envelope 100 and is not mixed with the gas in case 96, the test target gas to be collected must be diluted. There is no. Therefore, the measurement accuracy in gas analysis can be greatly improved by increasing the concentration of the sample gas to be sampled.
- the inside of the case 96 is prevented from being depressurized in this way, various problems caused by the decompression can be eliminated. That is, the amount of the gas to be inspected that is radiated from the inspection object 80 is promoted by the decompression, and the gas concentration becomes higher than usual. An error in the gas concentration to be analyzed can be prevented. Considering the decompression effect, the case 96 requires extremely high pressure tightness.
- FIG. 14 shows a modification of the third embodiment, in which the same components as those in the third embodiment are denoted by the same reference numerals, and redundant description will be omitted.
- the gas collector 10b of this modified example is provided with two envelopes 100 and 104 in a case 96, and one of the first envelopes 100 is used as a bag for maintaining the internal pressure, and the other is used as a bag for maintaining the internal pressure.
- the second envelope 104 is used as a volume changing bag. That is, the first envelope 100 is for maintaining the internal pressure in the case 96 constant as shown in the third embodiment, and the gas in the case 96 is started by starting the gas collection work.
- the air is sucked from the sampling port 98 by the air pump 12
- the air outside the case 96 flows into the first envelope 100 following the pressure drop in the case 96 caused by the suction of this gas. It is being introduced.
- the second envelope 104 is provided with a gas supply / discharge opening / closing means after introducing air or the like through a pipe 106 in advance and inflating the inside of the case 96 before starting the gas collecting work.
- the cock 114 is closed and used, and the substantial volume in the case 96 can be changed by expanding the second envelope 104. Therefore, in this modified example, if the amount of gas to be inspected from the inspection object 80 is small and the gas concentration in the case 96 cannot be measured without leaving it for a long time, the second envelope By expanding the 104 to reduce the actual volume in the case 96, even if the amount of gas to be inspected is small, high-concentration gas can be stored in the case 96 in a short time. Can be produced.
- the actual volume in the case 96 can be changed without changing the size of the case 96 itself. This eliminates the hassle of preparing the case 96 and replacing it each time.
- the above-mentioned first envelope 100 also includes the case 96
- the outside air of the case 96 is freely introduced following the removal of the gas, so that the expansion of the first envelope 100 can keep the air pressure in the case 96 constant.
- the first envelope 100 and the second envelope 1 Although the case where one is provided for each of the 04 is shown, the present invention is not limited to this, and a plurality of each may be provided.
- FIG. 15 shows still another modification of the third embodiment, in which the same components as those in the third embodiment are denoted by the same reference numerals, and redundant description will be omitted.
- the gas collecting device 1 Ob of this modified example is configured such that a case 96 is formed in a cover shape with an opened bottom, and a packing 116 is attached to the periphery of the opening 96 a.
- the opening 96a of the above case 96 is hermetically sealed with the existing inspection object 80 such as the floor or wall.
- the inside of the case 96 can be kept in an airtight state through the packing 116 around the opening 96a. For this reason, the gas to be inspected radiated from the floor or wall can be collected in the case 96, and the gas to be inspected collected in the case 96 can be collected by the gas collecting device 1 shown in FIG. It can be analyzed by 0.
- the exclusive pressure is not limited to the atmosphere.
- An adjusting gas container such as a cylinder filled with an adjusting gas or a volume adjusting gas is connected to the tubes 102 and 106, respectively, and the dedicated gas sealed in the container is connected to the tubes 10 and 10. It can also be supplied to each envelope 100, 104 via 2, 106.
- the case 96 from a transparent material, it is possible to easily confirm the installation status of the inspection target 80 and to easily observe the state of the surface of the inspection target 80.
- the fourth embodiment of the gas collecting apparatus basically
- the case 1 18 covers the space in an airtight manner from the outside and encloses the gas to be inspected radiated from the inspection object 80 enclosed therein, and the case 1 18 is provided in the case 1 18 A pair of gas circulation ports 120, 122 for circulating gas, and an air pump 124 for sucking the gas containing the gas to be inspected from the space to be inspected in the case 118,
- An impinger 128 serving as a collecting container into which a collecting liquid 126 for collecting the gas to be inspected from the gas is connected, and one end is connected to the impinger 128 and the other end is the case 118.
- One end of the pipe 130 is connected to one of the gas circulation ports 120 and serves as an introduction passage for introducing the gas into the bin jar 128, and one end is connected to the bin jar 128.
- the other end is connected to the intake port 1 2 4a of the air pump 1 2 4
- a pipe 13 2 as a suction flow path for guiding the above-mentioned gas in the inbinger 128 to the air pump 124, an exhaust port 124 b of the air pump 124 and the other of the case 118.
- the gas pressure is buffered while temporarily storing the gas discharged from the air pump 124 and circulating and supplying the gas to the case 118 again.
- a buffer 13 provided between the buffer 13 4 and the impinger 12 28 to adjust the humidity of the circulated gas to a constant level.
- the humidity adjusting means is a humidity control medicine bottle 1 36 into which a humidity adjusting liquid 140 prepared by a salt aqueous solution for adjusting the humidity of the gas is injected, and the impinger 1 28 is made of a transparent material. It is formed and used as a colorimetric tube, and as a reaction tube into which reagents that react with the gas to be inspected are injected, and a plurality of such tubes are provided in parallel.
- a solenoid valve 14 as switching means for selectively switching the communication between each of the plurality of impingers 128 and the case 118 with time between the gas circulation port 120 and the case 118. 2 are provided and configured.
- the fourth embodiment is of a type in which the gas to be inspected is collected while the gas in the space to be inspected sealed in the case 96 is circulated in a closed loop circuit.
- Fig. 16 shows a case where one impinger 128 is used
- Fig. 17 shows a case where a plurality of impingers 128 are selectively used by a solenoid valve 142. Is shown.
- the gas collecting device 10c of the present embodiment was formed in a hemispherical shape of a predetermined thickness with a transparent material for collecting the gas to be inspected which naturally radiates from the inspection site.
- a case 1 18 is provided.Around this case 1 18, an impinger 1 2 8, an air pump 1 2 4, a humidity control medicine bottle 1 3 6 and a buffer 1 3 4 are connected in this order, and a closed flow in which gas circulates.
- a passage is configured, and the gas to be inspected is collected by the impinger 128 while the gas in the case 118 is forcibly sucked and circulated by the air pump 124.
- the case 1 18 has a gas circulation port 122 that takes in the circulating gas and a gas circulation port 120 that sends out the gas mixed with the gas to be inspected from the case 118.
- a packing 1 38 made of soft rubber or the like is attached, and the packing 1 38 is pressed against the surface of the inspection object 80, whereby the case 1 1 1 8 It is designed to seal the inside.
- the inbin jar 128, the pipe 130 for introducing the gas into it, and the pipe 132 for introducing the gas therefrom are the same as those in the first embodiment and the pipes 24, 26 of the first embodiment.
- the cap of the impinger 128 is also covered with an insulating layer made of a material that does not affect the collected liquid 126, as described above.
- the air pump 124 is driven by a battery such as a dry battery and is portable, and the intake port 124 a is connected to the impinger 128 and the pipe 1.
- the exhaust port 124b is connected to the humidity control bottle 136, while being connected via 32.
- the humidity control medicine bottle 1 36 is formed of a cylindrical glass bottle, and the upper end opening is closed with a rubber cap. A predetermined amount of a humidity control liquid 140 composed of an aqueous salt solution is injected into the humidity control drug bottle 1 36, and the end of the pipe 144 on the gas intake side reaches the inside of the humidity control liquid 140. The end of the pipe that extends and exhausts gas 1 4 6
- the humidity adjusting solution 1 4 can be used saturated solvent solution of B a C 1 2 ⁇ 2 H 2 0 is saline solution, the leading air to the saturated solution 2 4.5 With this, the air becomes 88% humidity, and the humidity of the passing air can be maintained at a predetermined level.
- the humidity in the air in contact with the aqueous salt solution shows a constant value depending on the type, concentration, and temperature of the salt based on the steam pressure of the aqueous salt solution.
- Etc. the values are disclosed, so that the salts may be appropriately selected according to the humidity to be set.
- the knob 134 is formed of a plastic film or the like, and is a bag having a variable volume.
- an inlet port 148 for taking in the flowing gas and a discharge port 150 for sending out the internal gas are provided facing each other, and the inlet port 148 is connected to the humidity control bottle 1 36
- the outlet 150 was connected to the gas circulation port 122 of the case 118, according to the difference between the gas pressure introduced inside and the outside air pressure. It has a bulging volume. In other words, when the internal pressure rises, it expands, and when the internal pressure decreases, it contracts and acts so that the pressure difference between the inside and the outside naturally becomes zero, and the gas circulates without pressure fluctuation.
- the air pump 1 24 is driven while the opening 1 18a of the case 118 is pressed against the inspection object 80.
- the packing 1 38 is provided in the opening 1 18 a of the case 1 18, it can be sealed by pressing it against the surface of the inspection object 80. it can.
- the case 118 is formed transparent, it is possible to confirm the installation status and easily observe the state of the surface of the inspection object 80. Then, gas is sucked by the air pump 124, so that the gas inside the case 118 is taken into the impinger 128, and the collected liquid 126 of the impinger 128 is bubbled. Is passed and sucked into the hair pump 124.
- the sucked gas is exhausted from the exhaust port 1 24 b of the air pump 124, passes through the humidity control bottle 130, and the buffer 134, and is returned to the case 118 again. Circulate.
- the inspection radiation from the inspection target 80 The gas to be inspected is taken into the collected liquid 1 26 from the inside of the sealed case 1 18 by bubbling and passing through the collected liquid 1 26 of the inbinger 1 28.
- the gas returned from the nomefa 134 to the inside of the case 118 has been cleaned because the gas to be inspected has been collected by the impinger 128, and furthermore, the humidity control medicine bottle 13 6 keeps the humidity constant.
- the gas to be inspected is collected while circulating the gas for a predetermined time, and the amount of the gas to be inspected contained in the collected liquid 126 of the impinger 128 is quantitatively analyzed by a chemical method.
- the gas emission amount at this time can be obtained by the above equation (1).
- the pulsation of the air pump 124 and the pressure difference caused by the change in the ambient temperature exerts a pressurizing or depressurizing action on the inspection target space covered by the case 118, thereby leaking the circulating gas to the outside.
- the outside air is sucked into the outside air, which causes measurement errors and exerts a pressurizing or depressurizing effect on the gas-dissipating surface of the inspection target 80, making it impossible to measure the natural amount of radiation.
- Such problems can be prevented, and the inspection accuracy of the gas to be inspected can be improved.
- the humidity control bottle 136 is interposed in the gas circulation path around the case 118, the humidity of the circulated gas can be maintained at a predetermined level by utilizing the water vapor pressure equilibrium of the saline solution.
- the amount of gas to be inspected may change depending on the humidity of the circulating gas. Quality can be improved.
- the gas is circulated around the case 118, there is no need for a purifying gas supply device such as a clean gas supply device or a nitrogen gas supply device as an alternative.
- 10c has a simple structure, can be downsized, and is inexpensive.
- the gas collecting device 10c of the present embodiment is capable of inspecting a building material as a single material, similarly to the gas collecting devices 10a and 10b of the second and third embodiments.
- the gas to be inspected can be collected at any place in the building where the material has been used, that is, the building that has been completed.
- the case may be a box-shaped chamber for accommodating the test material pieces as exemplified in the third embodiment.
- FIG. 17 shows a modified example of the fourth embodiment, in which a plurality of impingers 128 are provided so that changes in the amount of emission of the gas to be inspected over time can be sequentially tracked. .
- a plurality of the impingers 128 are provided in parallel, and a solenoid valve 14 for switching the connection between the impingers 128 and the case 118 is provided. 2 is provided so that the solenoid valves 142 are switched at predetermined collection times.
- the switching of the solenoid valves 142 may be automatically performed by the timer control, and in the present modification, the connection of the injectors 128 is switched sequentially.
- This gas collecting device 10c is suitable for investigating the phenomenon of emission of ammonia gas generated from paint.
- the amount of ammonia gas emitted (emission rate) is determined by the lapse of time from immediately after application of the paint to completion of curing. As the gas changes, the gas collection can be performed over time by switching the gas collection sequentially, and the process can be tracked.
- Equipment such as the Inbinja 14 as a consumable item to be replaced, is provided as an analysis kit.
- the analysis kit is
- a 2N—KOH solution (a 2N aqueous sodium hydroxide solution) was used as the collecting liquid 28, and the impingers 14 into which the collecting liquid 28 had been injected 2.0 milliliters were 10 to 20. a book and,
- the impinger 14 is attached to the gas collecting device 10 to suck the gas containing formaldehyde.
- the required time is about 10 minutes as a standard, with the gas suction volume of 3 liters as standard.
- the inbin jar 14 of (i) used in the analysis kit can efficiently remove formaldehyde in the gas by using a 2N-KOH solution as the collecting solution 28. Collection is possible, and collection efficiency is increased. Further, since the collected liquid 28 is reduced to 2.0 milliliters, the concentration is increased even if the amount of sucked gas is small, and the detection becomes easy even at a low gas concentration. This is an appropriate concentration for ensuring the reactivity of the AHMT reagent to be added later (ii), and it is not necessary to add the reagent afterwards.
- the concentrations of the AHMT reagent and the KI ⁇ ⁇ reagent required for the analysis are set so that the optimum reaction conditions can be obtained with respect to the collected liquid 28 and the amount of the added liquid in the syringe can be small. . That is, the composition of the AHMT reagent was 1% for AHMT, 1 for HC1. Mole / liter is used, and the composition of the KI04 reagent is KIO 1%, KOH: 0.25N.
- the amounts of addition of the two reagents are set so that 0.5 milliliter is appropriate for each. This means that if the concentration is lower than what is conventionally used, about 4 times the amount of addition is required, and as the total amount of liquid increases, the color develops and the detection sensitivity decreases. Also, if the amount of the reagent added is extremely reduced, the error in reading the liquid amount when measuring with a syringe increases. In this example, since the amount of both reagents used at a time is as small as 0.5 milliliter, many analyzes can be performed even if the amount of reagents carried is small.
- the two reagents are kitted in vials A and B in (ii) and (iii). Since these vials are bottles with a rubber cap for injection, the caps are removed. The reagent can be measured and taken out with a syringe without using a syringe. Therefore, there is no possibility that the reagent overflows or adheres to hands.
- the standard color solution shown in (V) was prepared in advance in a laboratory, using a standard color solution corresponding to the color development concentration obtained by reacting a known amount of formaldehyde with a reagent as the standard color solution. It is enclosed in the same container.
- the gas collecting device 10 is configured to be able to always suck a constant gas amount, if the indicated value of the absorbance meter is adjusted to a predetermined value with a standard colored liquid on the premise of the sucked gas amount, unknown
- the indicated value when measuring the absorbance of the sample can be read directly as the formaldehyde concentration. Therefore, calculations using the molecular weight of formaldehyde, the volume conversion coefficient as a gas, and the like become unnecessary.
- the portable absorbance meter (vii) a small and lightweight one operated by a dry battery is used, and is provided with a selective transmission filter having a wavelength of 530 nm.
- the measurement of formaldehyde concentration can be performed easily, easily, at a low cost and in a short time without any specialized knowledge, so that a new Even when inspecting in a building, it is possible to easily collect a large amount of survey data on how much formaldehyde is generated from which building material and how much is present in the indoor environment.
- the analysis kit comprises:
- a 2N—NaOH solution (a 2N aqueous solution of sodium hydroxide) was used as a collecting liquid 28, and the above-mentioned bin 14 as a collecting vessel into which 2.0 milliliters of this collecting liquid 28 was injected was used. 10-20,
- the concentration is set so that the optimal reaction conditions can be obtained and the amount of the liquid added to the syringe can be small. That is, the composition of AHMT reagent, AHMT: 1%, HC 10 4: a 4-5%, the composition of KI 0 4 reagents, ⁇ ⁇ 4: 1%, ⁇ : was 0. 2 to 0 3 N. Things are used.
- the operating procedure for measuring the formaldehyde concentration using the analysis kit is the same as that for the above kit.
- the collection liquid 28 and the AHMT reagent Since the AHMT reagent does not dissolve without the addition of acid, it is customary to add HC1 when dissolving this reagent. When handling this reagent, the reagent is collected with a syringe as described above to improve its operability.However, the AHMT reagent with HC1 added must be repeatedly collected with a syringe. Assuming that the stainless steel injection needle corrodes under the influence of HC1, the life of the needle is considered to be extremely short. In addition, reagents may be contaminated with eluting substances from the needle such as iron ions caused by corrosion of the needle, which may cause analysis errors.
- HC 10 4 in place of HC1.
- 2N—K ⁇ H a 2N aqueous solution of potassium hydroxide
- the collection liquid 28 in addition to the above 2N—NaOH.
- HC 10 4 to AHMT reagent when adopting the 2N-KOH as a collecting liquid 28, the water reacts with HC 1_Rei 4 and KOH when adding AHMT reagent collecting liquid 28 A poorly soluble perchloric acid rim is generated and the sample solution becomes cloudy. Therefore, in consideration of the use of HC 10 4 to AHMT reagents, we decided to use 2 N-NaOH as collecting liquid 28.
- the analysis kit in this case is (i) 10 to 20 bottles of the bin bin 14 into which the collected liquid 28 was injected, typically 2 to 3 milliliters,
- the above-described color-forming reaction is caused to occur while collecting formaldehyde gas, so that the operation of adding a reagent after the collection is completed and the waiting time for the reaction process can be eliminated.
- the collection liquid 28 is prepared by mixing an alkali reagent and a reducing reagent such as sodium thiosulfate at an appropriate mixing ratio.
- the alkaline reagent, AHMT reagents are used separately three kinds of KI 0 4 reagent.
- these reagents are mixed in advance, a normal reaction with formaldehyde does not take place, so it is necessary to separately add them in a predetermined order while keeping the time intervals required for the reaction.
- the use of the collecting liquid 28 of the present embodiment while it is possible to add a AHMT reagent before the gas collecting operation to the collecting liquid 28, KI 0 4 reagent is not required .
- the AHMT reagent can be added first, it is possible to generate a color reaction while collecting gas, and there is an advantage that the gas collecting operation can be performed while visually checking the state. .
- the color development reaction proceeds simultaneously with the gas collection, it is possible to omit the waiting time for the reaction after adding the AHMT reagent after the gas collection.
- KI 0 4 reagent is needed in order to produce a red colored material by oxidizing the reaction intermediate products AHMT reagent and formaldehyde, since it is possible to add a AHMT reagent previously, gas the oxygen in the air introduced into the liquid collection 28 catching in the course of collecting can function as an oxidizing agent, and it is possible to substitute the Re this to KI_ ⁇ 4 reagent, the result I 0 4 reagent also Another advantage is that it is unnecessary.
- the air in the inspection object space was injected into the inbinger 14 into which the fixed amount of the collection liquid 28 created by mixing the alkali reagent and the reducing reagent such as sodium thiosulfate at an appropriate mixing ratio was injected.
- the standard color solution is set in the absorbance meter to adjust the indicated value to a predetermined value, and then the above-mentioned invincible 14 is set in the absorbance meter, and the formaldehyde concentration is determined from the indicated value. Detect and analyze.
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Description
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP97912431A EP0884576A4 (en) | 1996-11-19 | 1997-11-12 | GAS COLLECTING DEVICE |
| AU49644/97A AU720646B2 (en) | 1996-11-19 | 1997-11-12 | Gas collecting system |
| US09/101,108 US6139801A (en) | 1996-11-19 | 1997-11-12 | Gas collecting apparatus |
Applications Claiming Priority (12)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8/308090 | 1996-11-19 | ||
| JP30809096A JP3198953B2 (ja) | 1996-11-19 | 1996-11-19 | ガス捕集装置 |
| JP8327262A JPH10170412A (ja) | 1996-12-06 | 1996-12-06 | ガス捕集器具 |
| JP8/327262 | 1996-12-06 | ||
| JP8/345389 | 1996-12-25 | ||
| JP8345389A JPH10185775A (ja) | 1996-12-25 | 1996-12-25 | ガス捕集装置 |
| JP9616797A JPH10289640A (ja) | 1997-04-14 | 1997-04-14 | 圧力スイッチ |
| JP9/96167 | 1997-04-14 | ||
| JP26018297A JPH11101722A (ja) | 1997-09-25 | 1997-09-25 | ガス分析用捕集器具 |
| JP9260180A JPH11101720A (ja) | 1997-09-25 | 1997-09-25 | ガス捕集装置 |
| JP9/260182 | 1997-09-25 | ||
| JP9/260180 | 1997-09-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1998022794A1 true WO1998022794A1 (en) | 1998-05-28 |
Family
ID=27551976
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP1997/004118 Ceased WO1998022794A1 (en) | 1996-11-19 | 1997-11-12 | Gas collecting apparatus |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US6139801A (ja) |
| EP (1) | EP0884576A4 (ja) |
| AU (1) | AU720646B2 (ja) |
| WO (1) | WO1998022794A1 (ja) |
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| CN108181140A (zh) * | 2018-01-30 | 2018-06-19 | 苏州大学卫生与环境技术研究所 | 便携式大气采样装置 |
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| JP4684300B2 (ja) * | 2005-02-02 | 2011-05-18 | モコン・インコーポレーテッド | 密封シールされた包装における漏洩の大きさの検出及び報告用装置及び方法 |
| WO2006088542A2 (en) * | 2005-02-14 | 2006-08-24 | Mocon, Inc. | Detecting and reporting the location of a leak in hermetically sealed packaging |
| JP6290564B2 (ja) * | 2013-09-17 | 2018-03-07 | 株式会社トクヤマ | 環境大気中の揮発性塩素化炭化水素の測定方法 |
| EP3088887B1 (de) * | 2015-05-01 | 2017-08-16 | CTC Analytics AG | Vorrichtung zur extraktion flüchtiger komponenten |
| CN204988804U (zh) * | 2015-05-29 | 2016-01-20 | 彭万旺 | 一种高压合成气体快速取样装置 |
| DE202015103043U1 (de) * | 2015-06-11 | 2016-09-14 | Swiss Innotech Ag | Vorrichtung zur Volumenbestimmung von Fluiden |
| KR20170054631A (ko) * | 2015-11-09 | 2017-05-18 | 삼성전자주식회사 | 수분 검사 장치 |
| EP3933024B1 (en) * | 2020-07-02 | 2022-10-26 | LG Chem, Ltd. | Gas collection device |
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| CN116642633B (zh) * | 2023-04-23 | 2026-03-20 | 中国人民解放军空军工程大学 | 一种机载设备健康状态监测设备 |
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| JPH06221970A (ja) * | 1993-01-23 | 1994-08-12 | Honda Motor Co Ltd | 試料蒸散ガス収集用ハウジングの圧力変動吸収用装置 |
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| US4511658A (en) * | 1983-02-28 | 1985-04-16 | Kansas State University Research Foundation | Colorimetric detector for formaldehyde vapor |
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| DE3617023C1 (de) * | 1986-05-21 | 1987-10-08 | Draegerwerk Ag | Kolorimetrische Nachweiseinrichtung |
| WO1988001299A1 (en) * | 1986-08-11 | 1988-02-25 | Massachusetts Institute Of Technology | Method and apparatus for detecting gaseous compounds |
| JPS6433063A (en) * | 1987-07-24 | 1989-02-02 | Matsushita Electric Industrial Co Ltd | Production of lead-containing ceramic material |
| JPH07115767B2 (ja) * | 1987-08-24 | 1995-12-13 | 三田工業株式会社 | 画像生成機 |
| SE464049B (sv) * | 1988-07-08 | 1991-02-25 | Stig Joakim Forssman | Saett och anordning foer maetning av formaldehydemission fraan ytor |
| JP2766380B2 (ja) * | 1990-06-19 | 1998-06-18 | 株式会社東芝 | モデムプーリングシステム |
| US5246668A (en) * | 1990-09-20 | 1993-09-21 | Space Biospheres Ventures | Air sampling and analysis system |
| RU2045754C1 (ru) * | 1992-06-05 | 1995-10-10 | Красноярская государственная технологическая академия | Адгезиометр |
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- 1997-11-12 US US09/101,108 patent/US6139801A/en not_active Expired - Fee Related
- 1997-11-12 EP EP97912431A patent/EP0884576A4/en not_active Withdrawn
- 1997-11-12 AU AU49644/97A patent/AU720646B2/en not_active Ceased
- 1997-11-12 WO PCT/JP1997/004118 patent/WO1998022794A1/ja not_active Ceased
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108181140A (zh) * | 2018-01-30 | 2018-06-19 | 苏州大学卫生与环境技术研究所 | 便携式大气采样装置 |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0884576A4 (en) | 2002-04-17 |
| AU4964497A (en) | 1998-06-10 |
| US6139801A (en) | 2000-10-31 |
| EP0884576A1 (en) | 1998-12-16 |
| AU720646B2 (en) | 2000-06-08 |
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