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Abstract: A simple and rapid method to determine residues of five organophosphorus insecticides, chlorfenvinphos, diazmon, dichlorvos, malathion and sulfotepp, from the cultivated mushroom, Agaricus bisporus (Lange) Imbach, is described. Ethyl acetate is used as the solvent for extraction, and after evaporation of the extract, the residue, dissolved in ethyl acetate is injected directly without purification into a gas Chromatograph provided with a nitrogen-phosphorus specific thermoionic detector and packed column 10%OV-101 on Chromosorb WHP (80-100 mesh). The rate of recovery was higher than 80% for the five insecticides added at two different application levels, 0.2 and 2.0 mg/kg mushrooms. The results, obtained by using this method to find the residue levels resulting from the application, of several commercial pesticide amounts containing all the active ingredients investigated, at different growing cycle stages, are presented.
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