A spectrophotometric method for the determination of carhonyl sulfide in petroleum refinery gases is based on the reaction of carbonyl sulfide with piperidine in aqueous solution to form piperidine oxythiocarbamate. This analysis is performed without any interference from hydrogen, oxygen, nitrogen, carbon monoxide, methane, ethane, acetylene, ethylene, propane, and propylene; and techniques are presented for either removing or correcting interferences that result from the presence of hydrogen sulfide, methyl mercaptan, carbon dioxide, sulfur dioxide, carbon disulfide, thiophene, and conjugated diolefins. An accuracy of 1 p.p.m. of carbonyl sulfide can be obtained for synthetic blends within the range of 1 to 50 p.p.m.The results on refinery samples are reliable to within 10% of the amount present in the range from 1 to 50 p.p.m. of carbonyl sulfide.Straight-bore stopcock G.
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