A procedure is described for the determination of malathion and dichlorvos in grain. After extraction with methanol, and clean-up on a charcoal column, if required, the pesticide residues are determined by gasliquid chromatography on Apiezon L and butane-1,4-diol succinate columns with a phosphorus-sensitive detector.Between the concentrations of 0.25 and 10 p.p.m. both pesticides were recovered from spiked samples with between 87 and 99 per cent. efficiency.
Details are given of the methods of analysis used in the determination of organophosphorus pesticide residues in each of the food groups into which the total diet samples were divided. Residues of only 6 pesticides were detected. Malathion was the most commonly found, mainly in the cereal foods group of the diet, but all the residues were at low levels.
A method for the determination of carbarsone in poultry meat is described. The carbarsone is extracted from the sample with methanol and, after clean-up on an ion-exchange column, hydrolysed to arsanilic acid with sodium hydroxide. The arsanilic acid is diazotised, coupled with 2-aminoethyl-l-naphthylamine and determined spectrophotometrically.
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