Method for determination of low-concentration H2S in air

A determination method and technology for hydrogen sulfide, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of immaturity, poor test reproducibility, inaccurate test results, etc., and achieve fast analysis speed, accurate results and high sensitivity. Effect

Active Publication Date: 2013-07-31
CHINA CERTIFICATION & INSPECTION GRP ANHUI
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Problems solved by technology

Among all the above methods, the most sensitive ones are the methylene blue method and gas chromatography, but when 30L is sampled, the detection limit of the methylene blue method can only reach 5 μg / m 3 ; When injecting 1L, the detection limit of gas chromatography can only reach (1-5) μg / m 3 , and when testing low-content hydrogen sulfide, this method has extremely high requirements for the pretreatment of the gas extraction device, the configuration and inertization treatment of the gas chromatograph sampling system, and the preparation level of the standard gas, which often results in test reproducibility Poor performance, inaccurate test results
Determination of hydrogen sulfide at the background concentration level in the air (3 ) There is no mature method at present, so it is necessary to establish a method that can accurately measure low-concentration hydrogen sulfide in indoor and outdoor air environments

Method used

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  • Method for determination of low-concentration H2S in air
  • Method for determination of low-concentration H2S in air
  • Method for determination of low-concentration H2S in air

Examples

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Embodiment 1

[0079] The mensuration of hydrogen sulfide concentration in embodiment 1, indoor and outdoor air environment

[0080] Detect the concentration of hydrogen sulfide in indoor and outdoor air environment with the method of the present invention, concrete method comprises the following steps:

[0081] 1. Collection of hydrogen sulfide samples in the air

[0082] Obtaining the solution to be tested: Put 10mL of NaOH and disodium ethylenediaminetetraacetic acid (EDTA) mixed solution as the absorption solution (the concentration of NaOH in the mixed solution is 20mM, and the mass fraction of EDTA is 0.5%) into the absorption bottle, and use The atmospheric sampler collects air into the absorption liquid, the gas sampling flow rate is 1L / min (0.2-2L / min is acceptable), and the gas sampling time is 10min (5-20min is acceptable). After the gas extraction is completed, the absorption bottle should be sealed and stored, and the solution to be tested can be stored stably for more than 1 m...

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Abstract

The invention discloses a method for determination of low-concentration H2S in air. The method comprises that air is collected by an air sampler; H2S in the air is absorbed by a NaOH-EDTA mixed solution having a certain concentration so that the H2S is quantificationally transformed into S ions; an S ion concentration of the absorption solution subjected to high-purity nitrogen or argon preblowing is determined by an ion chromatograph (as an electrochemical detector); and the S ion concentration is further converted into H2S content of the air. The method has the advantages of high sensitivity, accurate result, good repeatability, simple experiment steps, fast analysis speed, no reagent pollution and reagent safety, and can be used for determination of a H2S concentration of indoor and outdoor air.

Description

technical field [0001] The invention relates to a method for measuring low-concentration hydrogen sulfide in various indoor and outdoor air environments in the field of air detection. Background technique [0002] Hydrogen sulfide is a colorless gas with the smell of rotten eggs. It exists widely in nature. It can be produced naturally by volcanoes, sulfur hot springs, natural gas and oil fields. It can also be produced by sulfur-reducing bacteria through biochemical reactions. In addition, petroleum refining, Industrial processes such as papermaking, sewage treatment, metal smelting and viscose yarn manufacturing can also be produced. [0003] Humans mainly come into contact with hydrogen sulfide through the respiratory system, inhale hydrogen sulfide, diffuse into the lungs, enter the blood circulation system, and then rapidly oxidize to sulfate through the liver, and excrete it through urine. There is a possibility of death when the concentration is greater than 500ppm. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/02G01N30/06
Inventor 郭中宝梅一飞马振珠白永智崔金华韩蔚丁建军王潇刘实华
Owner CHINA CERTIFICATION & INSPECTION GRP ANHUI
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