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本文提出在甲苯－冰乙酸－乙醇－ＮａＢｒ电解液中电生溴库仑滴定电位法指示终点直接测定渣油中硫醚硫的新方法。该电解液对渣油样溶解性能好，终点电位突跃大，结果准确。经对不同渣油样（＞５００℃）的多次测定表明：当硫醚硫含量在０．５％左右时，本法的标准偏差＜０．０４％，相对标准偏差＜５％。测定结果与ＫＩＯ＿３电位滴定法、Ｐｂ（Ａｃ）＿４电位滴定法吻合，符合测定要求。
In this paper, a new method for the direct determination of thio-sulfur in residual oil by the terminal point of the coulometric titration of coulombic acid in toluene-glacial acetic acid-ethanol-NaBr electrolyte was proposed. The electrolyte of the residue-like solubility, end potential sudden jump, the result is accurate. The determination of different residue samples (> 500 ℃) showed that the standard deviation of this method was less than 0.04% and the relative standard deviation was less than 5% when the sulfur content was about 0.5%. The determination results coincide with KIO_3 potentiometric titration and Pb (Ac) _4 potentiometric titration to meet the determination requirements.