The hydrogen production dry gas contains a higher level of hydrogen sulfide compared to the total sulfur content
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For the analysis of the raw gas used in hydrogen production facilities, the hydrogen sulfide level detected using hydrogen sulfide test tubes is above 200 mg/m3, yet the total sulfur level measured by chromatography is below 100 mg/m3. This is the case for samples taken over several shifts. What is the reason for this? Why is the hydrogen sulfide level higher than the total sulfur level? I would appreciate guidance from those who have encountered similar situations
There were also doubts, but the laboratory conducted repeated tests, and samples were sent to another laboratory for analysis as well; the results from that analysis showed no issues
Hydrogen sulfide test strips are a simple testing tool; they are not accurate at low concentrations, and their performance is also greatly influenced by the way in which the test is carried out.
Currently, analytically pure hydrogen sulfide is produced manually
There was a paper on Daqing that mentioned hydrogen arsenide and nitrogen oxides, which can affect the color development in the detection tube! Moreover, sampling rubber bladders will absorb hydrogen sulfide!
The test tube is only a simple method for reference purposes. The laboratory analysis results shall take precedence.
The inspection tube provides only a rough result; chromatographic analysis is the main method used. Different people using test tubes to measure the same gas will obtain reading errors of several dozen ppm