[Residue analysis of plant material for organophosphorus pesticides with thioether groups including their sulphoxides and sulphones (author's transl)].

Residue analysis of food of plant origin for organophosphorus pesticides containing thioether groups should include the corresponding sulphoxide and sulphone metabolites. A method is proposed, consisting of a simple clean-up step for extracts from plant material and subsequent oxidation with potassium permanganate. The sulphones formed are detected and determined by gas-liquid chromatography with alkali flame thermionic detection.