Abstract
A method for systematic determination of organophosphorus, carbamate, organochlorine and pyrethroid pesticides in polished rice by GC was developed. The pesticides were extracted from the sample with acetone-water (7:3) mixture, and re-extracted into ethyl acetate. Organophosphorus pesticides in the extract were directly determined without purification. On the other hand, half of the extract was purified over a Florisil column and used for determination of organochlorine and pyrethroid pesticides. The other half of the extract was purified on a silica gel column and used for determination of carbamate pesticides. No pesticide was found in 56 samples of polished rice from Thailand. The detection limit of the proposed method was 0.001ppm for organophosphorus and organochlorine pesticides and 0.01ppm for carbamate and pyrethroid pesticides.
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