This method is for the determination of low concentrations of sulfur, ranging from 0.1 to 200 ppm, in distillate stocks free of hydrogen sulfide. It may be applied to non-olefinic materials, such as straight run naphthas, hydrogen treated stocks, reformates and aromatic hydrocarbons. It is limited to samples containing not more than 2% olefins. Oxidized sulfur forms, such as sulfonic acids, are not determined quantitatively; therefore, this method must be applied with discretion to the analysis of stocks which have been treated with sulfuric acid.