AbstractA simple and rapid procedure is described for the qualitative and quantitative analysis of metabolites of malathion and other insecticides. The omission of an extraction at low pH, and mild conditions of anion‐exchange chromatography on QAE‐Sephadex prevent the degradation of a malathion metabolite,S‐(1‐carboxy‐2‐ethoxycarbonyl)‐ethylO,O‐dimethyl phosphorothioate (malaoxon α‐carboxylic acid), which takes place under strongly acid conditions. Disadvantages of the commonly used fractionation of malathion and malaoxon metabolites based on partitio
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