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Abstract A sensitive and reliable gas chromatographic/mass spectrometric (GC/MS) method for determining acetochlor in environmental water samples was developed. The method involves automated extraction of the herbicide from a filtered 1 L water sample through a C18 solid-phase extraction column, elution from the column with hexane-isopropyl alcohol (3 + 1), and concentration of the extract with nitrogen gas. The herbicide is quantitated by capillary/column GC/MS with selected-ion monitoring of 3 characteristic ions. The single-operator method detection limit for reagent water samples is 0. 0015 μg/L Mean recoveries ranged from about 92 to 115% for 3 water matrixes fortified at 0. 05 and 0. 5 μg. Average single-operator precision, over the course of 1 week, was better than 5%.
Lindley et al. (Mon,) studied this question.