An analytical method was established for the determination of the main corrosive sulfide

dibenzyl disulfide(DBDS) in transformer insulating oil by high performance liquid chromatography(HPLC) with vortex assisted liquid-liquid microextraction(VA-LLME).Under the optimized conditions

the DBDS was quantified by external standard method and internal standard method with acetonitrile as extractant.Results showed that there were good linear relationship for DBDS in the concentration range of 0.1-600.0 mg/kg with correlation coefficients(r) more than 0.999.The limits of detection(LOD

S/N=3) were in the range of 6.9-7.1 μg/kg.The method was applied in the determination of target analytes in commercial transformer oil samples and aging oil samples.The recoveries were in the range of 95.0%-112% with relative standard deviations(RSD) not more than 2.3%.The method has the characteristics of high efficiency

high sensitivity and environmental friendliness

and has no significant difference with the GC-ECD method of IEC 62697 in USA and GC-MS method of GB/T 32508 in China.It also provides references for the standards revision of quantitative detection of corrosive sulfide DBDS in transformer oils in China.