Abstract
Abstract Dimethoate and malathion in spiked lettuce extracts are separated by thin layer chromatography on silica gel followed by in situ fluorometric determination. Fluorescence is produced by spraying the developed chromatogram with a palladium chloride-calcein reagent. A ligand exchange occurs in which the palladium complexes preferentially with the sulfur in the pesticide, releasing the metal-fluorochromic indicator calcein. For dimethoate, a linear response is obtained for 10—100 ng/spot and the need for a preliminary cleanup procedure is eliminated.
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