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Method for measuring indium content in exhaust gas by utilizing flame atomic absorption spectrometry

A flame atomic absorption and indium content technology, which is applied in the measurement of color/spectral characteristics, etc., can solve the problems of endangering the personal safety of test personnel, easy explosion of hydrogen peroxide, affecting test results, etc. Operation, effect of shortening time

Inactive Publication Date: 2014-01-08
SUZHOU GUOHUAN ENVIRONMENT DETECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the flame atomic absorption spectrometry, a digestion solvent is needed to digest the elements to be measured in the sample to be tested. At present, the commonly used digestion solvent is sulfuric acid and hydrogen peroxide in a certain volume ratio. This solvent has the following disadvantages: 1. Hydrogen peroxide is prone to explosion during the heating process, which endangers the personal safety of the test personnel; 2. The boiling point of sulfuric acid is high, and it is easy to carbonize during the heating and digestion process, which affects the test results

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Use Taishan No. 3 glass fiber glue-free filter cartridge to collect 400L of exhaust gas, cut the filter cartridge that has collected exhaust gas samples into pieces with stainless steel scissors, and obtain the sample to be tested with indium, weigh 1.481g of the sample to be tested and place it in a 50mL high In a glass beaker, add 20mL of nitric acid solution (according to the volume mass ratio g / mL of the sample to be tested and the nitric acid solution is 1:13.5), wherein the composition and volume ratio of the nitric acid solution are: superior pure nitric acid , 18MΩ·cm deionized water 1, sufficient and specific proportion of nitric acid can quickly dissolve the indium in the sample, and at the same time, it is not easy to produce carbonization. After adding the nitric acid solution, cover the watch glass of the beaker and seal it. After sealing the watch glass, steam Form reflux, which is not conducive to the phenomenon of talking. Put it in an electric furnace an...

Embodiment 2

[0053] The difference from the conditions in Example 1 is that the beaker is covered with a watch glass and sealed, and then placed in an electric furnace for digestion at 90°C until the test solution is clear and transparent, and the digestion time is 352s;

[0054] Other test conditions are the same as in Example 1, and the sample solution to be tested is measured in parallel six times continuously, and the measurement results are obtained according to the working curve: 0.028 mg / L, 0.023 mg / L, 0.024 mg / L, 0.020 mg / L, 0.029 mg / L, 0.020 mg / L, and the calculated average value is 0.024 mg / L. Compared with Example 1, the content of indium is lower. After comprehensive analysis, it can be concluded that when the digestion temperature is 90°C, indium is not completely digested.

Embodiment 3

[0056] The difference from the conditions in Example 1 is that the beaker is covered with a watch glass and sealed, and then placed in an electric furnace for digestion at 110°C until the test solution is clear and transparent, and the digestion time is 315s;

[0057] Other test conditions are consistent with embodiment 1, do six parallel continuous measurements for the sample solution to be tested, draw the measurement results according to the working curve: 0.030 mg / L, 0.031 mg / L, 0.034 mg / L, 0.028 mg / L, 0.028 mg / L, 0.035 mg / L, and the calculated average value is 0.031 mg / L. Compared with Example 1, the content of indium is lower. After comprehensive analysis, it is concluded that: when the digestion temperature is 110 ° C, indium boils with nitric acid And lost.

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Abstract

The invention provides a method for measuring the indium content in exhaust gas by utilizing a flame atomic absorption spectrometry. According to the method, a solvent prepared by proportioning high-grade pure nitric acid with deionized water according to a volume ratio of 1:1 is taken as a digestion solvent of a to-be-measured sample, wherein the nitric acid in the proportion is low in boiling point and strong in oxidability and can rapidly digest indium in the to-be-measured sample without easily generating a carbonization phenomenon; as the heating-digestion temperature is controlled at 90-110 DEG C, the digestion speed of the indium is increased, and the time of the whole test is shortened. Meanwhile, the method provided by the invention has the advantages that the detection limit is low, and the test is simple and is easy to operate.

Description

technical field [0001] The invention relates to a method for measuring the indium content in the waste gas discharged from an electric welding workshop, in particular to a method for measuring the indium content in the waste gas based on flame atomic absorption spectrometry. Background technique [0002] The waste gas emitted by workshop electric welding with indium tin solder contains trace amounts of indium element. The atomic number of indium is 49, and its atomic weight is 114.82. 0.1mg / m 3 , while the standard for lead in these two countries is 0.15mg / m 3 , it can be seen that indium is more toxic than lead and should not be underestimated. It is harmful to the environment and can cause pollution to water bodies. Therefore, the detection of indium content in the exhaust gas from electric welding workshops is a must-test item for environmental monitoring. [0003] At present, the method for detecting indium content is mainly graphite furnace atomic absorption spectrom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
Inventor 徐晓华
Owner SUZHOU GUOHUAN ENVIRONMENT DETECTION
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