JPH057564Y2 - - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to a flameless atomic absorption spectrometer suitable for analyzing ultratrace components.

B. Prior Art A frameless atomic absorption spectrometer is configured to atomize a sample using a graphite tube that is maintained at a high temperature by applying a large current, and to detect the absorption spectrum that occurs when light is irradiated to the tube. It has the characteristic of being able to detect extremely small amounts of components with high precision.

By the way, when trying to detect extremely trace amounts of components contained in a sample, such as sodium, potassium, and calcium, using this frameless atomic absorption spectrometer, it is possible to detect very small amounts of components such as sodium, potassium, and calcium floating in the air. There was a problem in that the gas flowed into the atomization section along with the atmosphere, causing a large error in the measurement results.

C. Purpose This invention was developed in view of these problems, and its purpose is to eliminate the influence of dust and other impurities floating in the atmosphere,
An object of the present invention is to provide a frameless atomic absorption spectrometer capable of analyzing trace components in a sample with extremely high accuracy.

D. Outline of the invention In other words, the feature of the present invention is that the steps from sample injection to atomization are performed in a clean atmosphere.

E. Embodiments Therefore, details of the present invention will be explained below based on illustrated embodiments.

FIG. 2 shows an embodiment of the present invention, and the reference numeral 1 in the figure is an airtight case placed on the main body 2 of the frameless atomic absorption spectrometer, which contains sodium, potassium, calcium, etc. The container body 1a is made of a material such as fluorocarbon resin, and the lid body 1b has a through hole 1e connected to a duct. As shown in FIG. 1, the container body 1a is provided with bases 3, 3 having legs at a certain height from the bottom surface, on which a sample stand 4, a pipette cleaning cup 5, and a sample drain tank are installed. 6 and an atomization reactor 7 are placed thereon, and a pipette 10 for sample injection that can be moved from the sample stage 4 to the atomization reactor 7 by a drive device 9 along a guide member 8 is disposed above. .
Further, this container body 1a is provided with a water inlet 1c that connects to an ultrapure water source (not shown) and a drain port 1d that maintains a water level lower than the bases 3, 3, and this water inlet 1c is connected to a pipe. 11 communicates with the lower part of the container body 1a via the cleaning cup 5.

On the other hand, water sprinkling holes 13a, 1 are provided on the back side of the lid 1b.
3a, 13a, . . . are provided, and a water sprinkler 13 connected to an ultrapure water source and a roof member 14 covering the nuclear reactor 7 from the sample stage 4 are attached. In addition, the reference numeral 12 in the figure indicates a device that does not discharge components that interfere with the analysis.
Moreover, the cover is made of a heat-resistant fluororesin.

In this embodiment, after the sample cup S containing the sample is placed on the sample stage 4, the lid body 1b is set on the container body 1a.

After completing such preparations, if ultrapure water with a resistivity of 17 megohms or more is supplied to the water inlet 1c and the water sprinkling device 13, the water sprinkling holes 13a, 13a, 13a
The ultrapure water sprayed from ... dissolves dust and trace elements floating in the atmosphere inside the case 1, and falls along the roof member 14 to the lower part of the container body 1a. The ultrapure water flowing in from the inlet 1c is sent to the cleaning tank 5.
After filling the container body 1a, contaminated water from the water sprinkler 13, which flows into the lower part of the container body 1a and dissolves contaminant components in the atmosphere, is discharged from the discharge port 1d.

In this state, the sample in the sample cup is transferred to the nuclear reactor 7 using the pipette 10, and the sample is dropped from the sample injection port 7a of the reactor. The dropped sample is atomized in the atomization reactor 7, where there are no contaminant components, and the spectrum of the constituent components is detected by the atomization section optical system (not shown), and the detection signal is sent to the main body 2 and sent for data processing. be done.

On the other hand, the pipette 10 that has finished injecting the sample into the nuclear reactor 7 discharges the sample remaining inside into the waste liquid tank 6, moves to the cleaning tank 5, and drains the inside of the pipette with the ultrapure water filled there. Wash and wait.

The sample atomized in the reactor 7 leaks from the reactor 7 into the case 1, but most of it is discharged to the outside from the through hole 1e, and what remains inside is poured into the water sprinkler 13. It is adsorbed by the pure water spray, falls to the bottom of the case 1, is discharged to the outside from the discharge port 1d, and cannot accumulate in the case 1 space.

This ensures that the atmosphere surrounding the various equipment, including the nuclearization reactor 7, is always kept extremely clean and free of interfering components.

F. Effects As explained above, according to the present invention, the components necessary for the process from sample injection to atomization processing are housed in an area separate from the main body, and ultrapure water is sprayed here, so that it can be absorbed into the atmosphere. dust and various other impurities can be removed as an aqueous solution, background noise can be minimized, and trace component detection accuracy and reproducibility can be improved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part showing an embodiment of the present invention, and FIG. 2 is a perspective view showing an embodiment of the present invention. 1... Case, 1a... Container body, 1b... Lid,
2... Frameless atomic absorption spectrometer main body, 3...
...Base, 4...Sample stand, 5...Cleaning tank, 7...Flameless reactor, 10...Pipette, 13...
...watering equipment.

Claims (1)

[Scope of utility model registration request] A frameless atomic absorption spectrometer comprising a frameless nuclear reactor and a sample injection mechanism housed in a case body, and a water spraying member for spraying ultrapure water disposed inside the case.