JPH0441922Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention is an extraction filter used to extract each component in soil and filter it to separate it from soil, etc. when testing the chemical properties of soil. Regarding.

"Conventional Technology" In modern agriculture, with the intensification and efficiency of production, it is necessary to test the chemical properties of soil, that is, to qualitatively and quantitatively determine the active ingredients contained in the soil.

For these reasons, it is desirable to be able to test soil easily and quickly on-site.
Various simple soil testers have been adopted.

This type of simple soil tester can be used, for example, with an extract solution for extracting test components such as ammonia nitrogen, nitrate nitrogen, available phosphoric acid, coal, magnesia, etc. from a collected sample, and one that is sensitive to each of the above test components. It is equipped with reagents for coloring or suspending these components, and a colorimetric table and turbidimetric table for converting the concentration of the test component from the color development degree or suspension degree of the test component. There are known devices equipped with various instruments such as test tubes, funnels, filter paper, rubber stoppers, graduated cylinders, etc. for performing operations such as suspension.

To quantify each test component in soil using the above-mentioned simple soil tester, take a predetermined amount of sample (soil) into a test tube, and then inject the extract corresponding to the test component into the test tube. Then, cap the test tube with a rubber stopper and shake the test tube to extract the test component from the sample. Next, the turbid liquid of the extracted sample is filtered by pouring it into a filter paper that has been folded in advance and placed on a funnel that is inserted into another test tube that is propped up on a test tube stand. Once a sufficient amount of clear extraction filtrate has been obtained from the earth and sand through the filter paper, transfer the predetermined amount to another test tube, add a reagent according to the assay component, and mix uniformly to develop color or suspend.
Estimate the amount of the test component in the soil by comparing it with the corresponding colorimetric table and suspension table.

``Problems to be solved by the invention'' By the way, when using the above-mentioned simple soil tester, there are the following disadvantages.

In order to obtain a clear extracted filtrate from suspended soil after shaking the sample (soil) and extract in the same test tube, it is necessary to assemble the test tube stand, test tube, funnel, and filter paper. Moreover, the filter paper must be folded into four or sixteen folds before being attached to the funnel. Furthermore,
When transferring the suspension, do not accidentally spill it on the outside of the filter paper or allow it to overflow from the filter paper and cause dirt, etc. to pass between the filter paper and the funnel and mix into the filtrate.
A clear extraction filtrate may not be obtained, which impairs the purpose of the simple soil assay device, which is to allow even amateurs to perform the assay simply and quickly, regardless of the skill of operation.

This idea was made in view of the above circumstances,
The purpose is to provide an extraction filter that can easily perform extraction and filtration without complicating operations or increasing the number of equipment used.

"Means for Solving the Problems" The simple extraction filter of this invention consists of a cylindrical filtration body and a pair of bottomed cylindrical containers connected to the filtration body. A filter paper support plate is provided perpendicular to the central axis of the filter body, a filtrate drop part is provided on the filter paper support plate passing through the filter paper support plate, and a filter paper is removably arranged on the filter paper support plate, A deaeration groove is provided along the axial direction of the filtration body on the inner wall surface of the filtration body divided by the plate on the side opposite to the side where the filter paper is arranged, and a deaeration groove of the filter paper support plate is provided. A deaeration recess communicating with the deaeration groove is provided on the side, the pair of containers have the same configuration, and a deaeration hole is provided in the bottom of each of these containers,
The above-described provision includes a stopper that is removably fitted into the deaeration hole and that fits in a liquid-tight manner, and a liquid-tight means for connecting the container and the filtration body in a liquid-tight manner on at least one of the container and the filtration body. It was used as a means of solving problems.

``Example'' Hereinafter, the simple extraction filter of this invention will be explained in detail using the drawings.

FIGS. 1 to 4 are diagrams showing an embodiment of this invention, and reference numeral 1 in the figures indicates a simple extraction filter. This simple extraction filter 1 is made of transparent synthetic resin and includes a cylindrical filter body 2 and a pair of bottomed cylindrical containers 3, which are fitted and attached to the filter body 2.

The filter body 2 is made of a soft synthetic resin such as polyethylene, and as shown in FIG. 2, a filter paper support plate 4 is formed in the middle portion of the filter paper support plate 4 perpendicular to the central axis of the filter body 2. As shown in FIG. A filtrate drop hole (filtrate drop part) 5 is formed in the center of the filter paper support plate 4, and a filter paper 6 is removably arranged on the filter paper support plate 4. . As shown in FIG. 3, on the surface on which the filter paper 6 is arranged, a discharge groove 7 is formed which is concentric with the filtrate drop hole 5 and extends in the radial direction.

Further, on the surface of the filter paper support plate 4 opposite to the side on which the filter paper 6 is disposed, a protrusion 8 that protrudes from the filter paper support plate 4 is formed at the outer periphery of the opening of the filtrate drop hole 5. The protrusion 8 prevents the filter paper 6 from being erroneously placed on the surface on the protrusion 8 side. Further, on the inner wall surface of the filter main body 2 divided by the filter paper support plate 4 on the side where the protruding portion 8 is formed, a plurality of deaeration grooves 9 are provided along the axial direction of the filter main body 2. is formed. Then, on the surface of the filter paper support plate 4 on which the deaeration grooves 9... are provided,
Deaeration recesses 10 communicating with the deaeration grooves 9 are formed. Further, fitting grooves 11, 11 each having a U-shaped cross section are formed in the inner wall surface of the filter body 2 on both sides of the filter paper support plate 4 along the circumferential direction.

The containers 3, 3 have the same shape and the same dimensions, and are made of synthetic resin such as polypropylene. These containers 3, 3 have a deaeration hole 12 at the bottom thereof penetrating the bottom, as shown in FIG.
A stopper 13 is removably fitted into the deaeration hole 12 in a fluid-tight manner. Further, near the opening of the outer wall surface of the container 3, a fitting strip 14 that fits into the fitting groove 11 of the filter main body 2 is provided.
is formed protruding from the wall surface and along the circumferential direction of the wall surface. With this configuration, container 3
When the opening side is fitted into the filter main body 2 and fixedly attached, the fitting strips 14 are fitted into the fitting grooves 11 of the filter main body 2 and are attached to the filter main body 2 in a liquid-tight manner. Furthermore, a scale 15 is formed on the outer wall surface of the container 3 to indicate the volume from the bottom of the container 3.

In order to extract and filter each assay component in soil using the simple extraction filter 1 having such a configuration, first, a predetermined amount of sample (soil) is placed in one of the containers 3 with the stopper 13 attached. Then, a predetermined amount of the extract corresponding to the test component is poured into the container 3. Next, the side of the filter body 2 on which the filter paper 6 has been set in advance, on which the degassing grooves 9 are not formed, is fitted and attached to the container 3 in which the sample is placed and placed upright, and then this filter body The opening side of the other container 3 with the stopper 13 attached was fitted onto the side where the deaeration groove 9 of No. 2 was formed and the filter paper 6 was not set, and the container 3 was attached as shown in FIG. Assemble as shown. In this case, the filter main body 2 and the containers 3, 3 are connected in a liquid-tight manner by fitting the fitting grooves 9, 9 and the fitting strips 14, 14, and the container 3 on the side containing the sample is downwardly connected. positioned.

Next, with the sample-containing container 3 of the simple extraction filter 1 assembled in this way facing down, the simple extraction is carried out while pressing the plugs 13, 13 of each container 3, 3 at the same time with your fingers. Shake the filter 1 in its axial direction for several minutes.

Next, this simple extraction filter 1 is turned upside down and left standing with the container 3 on the side containing the sample facing upwards and the other container 3 facing downwards, and then the container 3 on the side containing the sample
Remove the stopper 13. Then, since the inside of the lower container 3 communicates with the outside air through the deaeration recess 10 and the deaeration groove 9 of the filtration body 2, the extract in the upper container 3 passes through the filter paper 6 and further flows into the filtration body 2. The filtrate is guided into the lower container 3 through the discharge groove 7 and the filtrate drop hole 5.

If the soil particles in the sample are fine and filtration takes time, use a pressure dropper (not shown) to pressurize the inside of the container 3 through the degassing hole 12 of the upper container 3 to speed up the filtration. You can also do this.

After the filtration is completed, the filter main body 2 is removed from the lower container 3, and the filtrate in the container 3 is divided into small containers such as test tubes prepared in advance. Furthermore, the filtrate in these small containers is appropriately diluted with distilled water, etc., a reagent corresponding to the assay component is added, shaken to develop color or suspension, and compared with the corresponding colorimetric table and suspension table. Estimate the amount of test component in. In this case, it is not necessarily necessary to divide the filtrate into small portions, and depending on the extract or assay components, or if the purpose is simply to qualitatively analyze the components, reagents may be added directly to the filtrate.

In the case of the simple filtration extractor 1 having such a configuration, by performing filtration and adding a reagent to the filtrate, a clear degree of color development and degree of suspension can be obtained, and thus a good assay can be performed. In addition, the extraction and filtration operations can be performed simply and in a short time by a series of operations, and the simple extraction filter 1 can be easily assembled because the containers 3 and 3 are configured the same. Therefore, it is a suitable instrument for use in a simple soil tester that aims to carry out simple, quick, and reliable testing.

In addition, in the above embodiment, the fitting groove 11 and the fitting strip 14 are formed as a liquid-tight means for liquid-tightly connecting the filter body 2 and the containers 3, 3, and these are fitted together. However, for example, the filter body 2 and the containers 3, 3 may be connected by screwing, or an O-ring may be provided on the filter body 2 or the containers 3, 3.
The connection between the filter body 2 and the containers 3, 3 may be kept liquid-tight by this O-ring.

Moreover, this simple pouring filter 1 is not limited to soil testing, and may be used for extraction operations in crop analysis, general chemical analysis requiring solid-liquid separation, and the like.

"Effects of the invention" As explained above, the simple filtration extractor of this invention consists of a cylindrical filter body and a pair of bottomed cylindrical containers connected to the filter body, and the sample and extract liquid are placed in the containers. The filter is shaken and then filtered through a filter paper placed on the filter body, so by adding the assay reagent to the filtrate, a clear degree of color development can be obtained.
A degree of suspension is obtained and thus a good assay can be performed. In addition, the extraction and filtration operations can be performed simply and in a short time through a series of operations, and since the pair of containers are configured identically, it is easy to assemble the simple extraction filter. It can be suitably used in a simple soil tester that aims to test simply and quickly.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of the simple extraction filter of this invention. Figure 1 is a perspective view showing the schematic structure of the simple extraction filter, and Figure 2 is a side sectional view of the filter body. 3 is a plan view of the filter main body seen from the side where the deaeration grooves are formed, and FIG. 4 is a partial sectional view showing the schematic structure of the container. 1... Simple extraction filter, 2... Filter main body, 3...
... Container, 4... Filter paper support plate, 5... Filtrate drop hole,
6...Filter paper, 7...Ejection groove, 8...Protrusion, 9...
... Deaeration groove, 10 ... Deaeration recess, 11 ... Fitting groove,
12... Deaeration hole, 13... Plug body, 14... Fitting strip, 15... Scale.

Claims (1)

[Scope of utility model registration request] It consists of a cylindrical filtration body and a pair of bottomed cylindrical containers connected to the filtration body, and a filter paper support plate is provided in the middle part of the filtration body and perpendicular to the central axis of the filtration body. A filtrate falling part passing through the filter paper support plate is provided, and a filter paper is removably arranged on the filter paper support plate, and the filter body divided by the filter paper support plate is opposite to the side on which the filter paper is arranged. A deaeration groove is provided along the axial direction of the filter body on the inner wall surface on the side thereof, and a deaeration recess that communicates with the deaeration groove is provided on the side of the filter paper support plate where the deaeration groove is provided, and the above-mentioned pair of containers have the same structure, a deaeration hole is provided at the bottom of each of these containers, a stopper is provided in the deaeration hole which is removably and fluid-tightly fitted, and at least one of the container and the filtration body is provided with a deaeration hole. A simple dispensing filter characterized by being provided with a liquid-tight means for liquid-tightly connecting the two.