Abstract
The phenylurea herbicides chlortoluron, diuron, fluometuron, isoproturon, linuron, methabenzthiazuron, and neburon have been separated by use of three different thin-layer chromatographic systems and quantified densitometrically at nanogram levels. Calibration plots were linear between 50 and 2500 ng for all the herbicides; correlation coefficients, r , were between 0.9962 and 0.9999. For determination of the herbicides in drinking water the substances were enriched from water samples by solid phase extraction (SPE) on C 18 cartridges. Recovery rates were between 91 and 102% except for methabenzthiazuron (87%); relative standard deviations were ±1.2–2.9%. A rapid fluorodensitometric screening method, involving thermal hydrolysis and subsequent derivatization with fluorescamine, was also developed for the phenylureas. This improved the limit of detection 25-fold.
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