Abstract
Systematic determination of organophosphorus, pyrethroid and organonitrogen pesticides in vegetables and fruits by GC was developed. Pesticides were extracted from samples using acetone, and re-extracted into hexane. Organophosphorus pesticides in the extract were directly determined by FPD-GC. For determination of pyrethroid (ECD-GC) and organonitrogen (NPD-GC) pesticides, the extract was purified by Florisil column chromatography using 30% ethyl acetate-hexane.The detection limits were 0.005-0.02ppm for pesticides. Organophosphorus, pyrethroid and organonitrogen pesticides were spiked at 0.1ppm, 0.2ppm and 0.2ppm, respectively. Except for dimethoate, ethiofencarb and lenacil, recoveries of pesticides were over 60%.
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