Determination of hydrogen sulfide content in gasoline
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As far as I know, there are currently no national or industry standards for determining the hydrogen sulfide content in gasoline. However, in gasoline desulfurization refining tests, such a method is needed to evaluate the test results. I would like to ask if anyone knows any good laboratory testing methods. Thank you!
Gas chromatography with a flame photometric detector should be able to perform the detection.
The original poster can try using a zinc-ammonia complexing solution to elute H2S from gasoline, and then use the iodometric method to titrate the zinc sulfide content in the solution in order to calculate the H2S content. This method has a relatively high detection limit and limited precision; if accurate measurement is required, chromatography should be used instead.
I agree with the view from the second floor. When analyzing benzene that enters the plant, we use a dedicated phosphorus-sulfur detector equipped with an FPD, which can detect sulfur at 0.1 ppm; it has high accuracy and excellent reproducibility
[quote]The original post was posted by Lin Mengyu on 2009-2-10 at 10:25. The poster can try using a zinc-ammonium complex solution to elute H2S from gasoline, and then use the iodometric method to titrate the amount of zinc sulfide in the solution in order to calculate the H2S content. This method has a relatively high detection limit and limited precision; if accurate measurement is required, chromatography should be used instead. How accurate is the measurement of this method? Additionally: I saw online that some people use the acidic sulfuric acid extraction method to determine hydrogen sulfide in gasoline. Although it’s just an abstract, I think this approach could work as well (Standard GB 1792 uses a cadmium sulfate solution in an acidic medium to treat hydrogen sulfide impurities), but I’m not sure what the level of measurement accuracy is In your opinion, what are the advantages and disadvantages of these two methods? I just need a measurement accuracy of the ppm level.
My method is based on \"GB 12211-90 Determination of hydrogen sulfide content in city gas.\" Without considering the elution rate, detection is primarily limited by the iodometric method. The detection limit of the iodimetry method is 1 mg/L, with a relative standard deviation of approximately 3.5%. As for the elution rate, it is definitely different when using zinc versus cadmium. The pKm of cadmium sulfide is 14.108 ； The pKm of zinc sulfide is 9.878. In terms of solubility alone, precipitation with mercury is more complete; the pKm of mercury sulfide is 24.977. Since I’m not in this field, I’ve just expanded a bit on the original poster’s question, for the poster’s reference only.
It can be seen that gas detection tubes are actually used quite often these days. I’m not very familiar with this; those who know it could explain the accuracy and the specific steps involved.
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