Abstract
A simple and rapid simultaneous gas chromatographic determination of 24 organophosphorus, 30 carbamate, 14 organochlorine and 8 pyrethroid pesticides in extract of polished rice was developed. The pesticides were extracted from the sample with methanol and acetone, and this extract was evaporated to dryness. The residue was dissolved in acetone. This simple method affords a high recovery of hydrophilic pesticides, allows rapid analysis, and is cheap to perform. No pesticide was found among 112 samples of polished rice from Thailand, the U. S. A, China and Australia. The detection limits of the proposed method were 0.001ppm for organophosphorus and organochlorine pesticides and 0.01ppm for carbamate and pyrethroid pesticides.
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