Analysis of Disulfoton Metabolites in Crops with GC-FPD and GC/MS

Two unknown peaks were detected on the chromatogram of turnip greens extract by GC-FPD. These unknown peaks were identified as dimetonthiol sulfone and disulfoton sulfone, which are metabolites of disulfoton, by GC/MS. As a result of investigation of 300 samples of crops, dimetonthiol sulfone was detected in the range of 0.22-1.6μg/g and disulfoton sulfone was detected in the range of 0.002-0.54μg/g in turnip, turnip greens and cauliflower. The recoveries of disulfoton and its metabolites fortified at the levels of 1.0μg/g and 10.0μg/g were more than 90%. The detection limit of dimetonthiol sulfone was 0.01μg/g and those of disulfoton and disulfoton sulfone were 0.001μg/g.