A method and device for detecting sulfide

A detection device and sulfide technology, applied in the field of analytical chemistry, can solve the problems of expensive and inconvenient to carry instruments, and achieve the effects of lowering the detection limit, improving detection sensitivity, and fast response speed
CN105044090BInactive Publication Date: 2018-05-08SHAANXI NORMAL UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHAANXI NORMAL UNIV
Publication Date
2018-05-08
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a sulfide detection method and device, which is to acidify the sulfide, convert the sulfide into hydrogen sulfide and separate it from the complex matrix, and use the inert gas nitrogen as the carrier gas to carry the generated hydrogen sulfide out into the The gas channel, when encountering the filter paper placed in the gas channel and adsorbed with methyl green, a reagent that has a selective response to hydrogen sulfide, the released hydrogen sulfide gas is enriched on the filter paper and reacts with methyl green. The color of methyl green changes from dark green to light green or colorless, and the intensity of light signal is recorded in real time, which simplifies the operation process of determining sulfide and reduces the interference caused by the complex matrix where endogenous sulfide is located. The invention enriches the hydrogen sulfide gas on the filter paper, reduces the detection limit, improves the detection sensitivity, and relatively low operating cost.
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Description

technical field

[0001] The invention belongs to the field of analytical chemistry and relates to a simple, sensitive and rapid method for measuring hydrogen sulfide and a portable hydrogen sulfide detection instrument with small volume and light weight. Background technique

[0002] h 2 S, a colorless, acidic gas with the smell of rotten eggs, is denser than air and soluble in water. At 0°C, 1 mole of water can dissolve about 2.6 moles of hydrogen sulfide. Hydrogen sulfide is an acute and highly toxic gas, and the concentration of hydrogen sulfide in the ambient air is usually 0.1-1 μg / m 3 . When the hydrogen sulfide concentration in the air is 70-150ppm, people will feel obvious eye and upper respiratory tract irritation; when it is 600-700ppm, the patient will feel dyspnea, chest tightness, dizziness, nausea, etc., and chemical pneumonia and emphysema will appear. It will soon fall into a coma from confusion; when it is above 700ppm, the patient will go into a coma with...

Claims

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