用极谱分析法测定了汽油中的硫化氢和硫醇硫的含量.以甲醇、吡啶、去离子水作为混合溶剂,以0.1 mol/L KOH溶液作为支持电解质。把传统的酸性底液改为碱性底液,提高了测定的灵敏度.不经过分离可分别测定硫化氢和硫醇硫的含量,最低检出限量均为1.0×10~(-7)mol/L,回收率在95％以上. The contents of hydrogen sulfide and mercaptan sulfur in gasoline were determined by polarographic analysis.Methanol, pyridine and deionized water were used as the mixed solvents and 0.1 mol / L KOH solution as the supporting electrolyte. The traditional acid bottom liquid was changed to basic liquid, which increased the sensitivity of determination.The contents of hydrogen sulfide and mercaptan sulfur were determined respectively without any separation.The minimum detection limit was 1.0 × 10 -7 mol / L, recovery rate above 95%.