Hydrogen sulfide electrochemical transducer

Abstract

The invention provides a hydrogen sulfide electrochemical transducer, which includes a working electrode, a reference electrode and a counter electrode that form ion conduction through electrolyte solution, wherein the working electrode is an Au-containing electrode; the electric potential of the working electrode relative to the reference electrode is within minus 40mV and plus 40mV; the electrolyte solution is H2SO4 solution or H3PO4 solution; and the reference electrode is an electrode that does not absorb alcohols in the system thereof. The transducer provided by the invention can be free from interferences from alcohols and carbon monoxide.

Description

technical field [0001] The present invention relates to a kind of hydrogen sulfide (H 2 S) electrochemical sensors, especially related to a kind of anti-carbon monoxide and anti-alcohol interference H 2 S electrochemical sensor. Background technique [0002] h 2 S gas is a colorless, highly toxic gas with the smell of rotten eggs. In factories, oil fields, and sewers, H 2 S gas is strictly monitored. [0003] due to H 2 The high toxicity of S, all countries have regulated its safety value. For example, in 2010, the American Association for Industrial Security (ACGIH) gave the following H 2 S safety value: 8-hour average weight (TWA-8hr.) is 1ppm, and 15-minute short-term exposure limit (STEL-15min) is 5ppm. [0004] In addition, in H 2 In the environment where the S sensor is used, there are often alcohol interfering gases, such as oil fields that need to detect H 2 S, some oil fields are located in relatively cold regions, such as Siberia, and sometimes alcohols s...

AI Technical Summary

Problems solved by technology

[0006] (1) The selection of the working electrode catalyst, this method has certain limitations, and the catalyst usually responds to a certain type of chemical substance;

[0007] (2) Use a chemical filter to remove interference, this method has a life limit;

[0008] (3) The intermediate electrolyte system, by selecting the composition of the intermediate electrolyte, the intermediate electrolyte can only react with the selective gas, but this system is generally more complicated, and the electrolyte has a capacity life limit, so it also has certain limitations sex;

[0009] (4) The choice of potential. This method has certain limitations. At a certain potential, the sensor usually responds to a certain type of chemical substance

However, although the above sensor has a small interference to CO, it has a great interference to methanol, and the performance of the sensor cannot be recovered for a long time

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