Abstract

Abstract A confirmatory procedure is described in which organothiophosphorus compounds are oxidized by neutralized sodium hypochlorite solution and the oxidation products are subjected to gas-liquid chromatography, using a flame photometric detector. Six pesticides, diazinon, ronnel, malathion, parathion, methyl parathion, and fenitrothion, were studied in 4 different substrates, peaches, blueberries, apples, and lettuce, at fortification levels of 0.25-0.5 ppm. These pesticides can be confirmed when present individually or in combination. Three pesticides, parathion, malathion, and diazinon, were shown to produce the corresponding oxons or oxygen analogs with retention times identical with the corresponding oxon reference standards.

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