Abstract
Abstract Residues of carbaryl were determined by a specific procedure based on the preparation of two derivatives. Samples of bees, bee bread, bee pollen, and cows’ milk were extracted with chloroform and cleaned up by acetonitrile petroleum ether partitioning and then by liquid chromatography. Subsequently the residues were hydrolyzed to 1-naphthol, part of which was trichloroacetylated and part of which was brominated and acetylated. Both derivatives were then determined by electron capture gas chromatography on the same column and at the same temperature . This procedure required only slightly more time than analysis by preparation of a single derivative. Recoveries from samples fortified at levels of 0.005–16.0 p pm ranged from 70 to 112%.
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