Rapid determination of hydrogen sulfide in acetylene
Thread Content
In accordance with GB 10665 \"Calcium carbide (acetylene calcium)\", hydrogen sulfide in acetylene is determined by the cadmium acetate-indirect iodometry method or the test tube method. The cadmium acetate-indirect iodometry method is the reference method; it takes a long time when used alone ； The test tube method is a semi-quantitative approach; the test tubes I purchased seem to have a detection limit that is not as good as that indicated in the instructions. The problem now is that the control system needs to quickly detect the hydrogen sulfide content in crude acetylene (acetylene produced at acetylene production plants) and pure acetylene (acetylene after purification). The cadmium acetate-indirect iodometry method is too slow, while the test tube method is not sensitive enough. I was wondering if any of you sailors have a better method to teach me?
I haven’t dealt with this area before, but I’m not sure what the hydrogen sulfide content in acetylene is, as you mentioned Is very precise quantification required? You can refer to the method for determining hydrogen sulfide in liquefied gas – the hydrogen sulfide test tube method; test tubes with different measurement ranges can be used, and the results remain reliable. Minimum measurable level: 2 mg/m3
Is the detection limit of your test tube that low? Which company’s product did you buy (if it’s not convenient to disclose, please send it to my email xwtsq@126.com)? I used test tubes from a company in Hebi; the instructions state that they can detect levels as low as 0.0001%, but when I used the chromium acetate-indirect iodometry method to analyze a sample containing 0.0029%, there was no response from the test tubes.
We use equipment from Beijing Chaoyang Beiyuan Testing and Analysis Instrument Factory, in accordance with the GB7230 standard. A test tube with a measurement range of 2–60 mg/m3 is used. It can be detected at levels of over ten ppm. When using it, it is essential to follow the instructions; the sample volume is very important.
We all use the iodometric method for titration