Abstract
Sulfur-containing substances in some vegetables often interfere in the analysis of residual organophosphorus insecticides by gas chromatograph equipped with a flame photometric detector. Elimination of such an interference required clean-up by Florisil column chromatography and selection of optimum flame condition for P mode flame photometric detector with least cross-interference. Recoveries of Diazinon, Ronnel, Malathion, Sumithion, and Parathion were from 74 to 106% for Japanese leek, onion, scallion, and garlic.
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