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Previous methods for the group sulfur analysis of petroleum oils have been fully applicable only to lowboiling distillates, such as gasoline, since the mercury salt techniques employed for differentiating nonthiophenic from thiophenic sulfur are limited to sulfur compounds in the lower molecular weight range.This limitation has been overcome, to a considerable extent, by employing selective catalytic decomposition to differentiate nonthiophenic from thiophenic sulfur. The nonthiophenic sulfur compounds are decomposed over alumina at 450°C. to hydrogen sulfide and, presumably, the corresponding olefin, while the thiophenic sulfur compounds are stable under these conditions.

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