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Plant Analytical Techniques
Gas Analysis: Determination of Hydrogen Sulfide by Cadmium Sulfide Precipitation
SCOPE AND FIELD OF APPLICATION
This method is suitable for the in situ determination of hydrogen sulfide in ammonia plant gas streams when testing is required during catalyst reduction.
Hydrogen sulfide present in the gas precipitates cadmium sulfide from a cadmium solution. The precipitate is filtered then reacted with iodine; the excess iodine is then titrated with sodium thiosulfate.