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This method is for determining hydrogen sulfide, mercaptan sulfur and carbonyl sulfide in gaseous hydrocarbons and in liquefied petroleum gas (LPG) of ordinary properties. Also covered is the determination of mercaptan in non-ordinary LPG which may contain a wide range of hydrocarbon types from ethane to such gasoline boiling range hydrocarbons as pentane and hexane. The hydrogen sulfide concentration range which can be determined is from 0.03 to several thousand grains per 100 cu ft (0.3 to several thousand wt-ppm). The method is also applicable to LPG samples containing as little as 1.0 ppm mercaptan sulfur.