National Water Quality Laboratory

Friday October 19, 2018

Journal of AOAC International

Determination of Low Concentrations of Acetochlor in Water by Automated Solid-Phase Extraction and Gas Chromatography with Mass-Selective Detection

Chris E. Lindley, Jeff T. Stewart, and Mark W. Sandstrom

February 1996

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 0.0015µg/L. Mean recoveries ranged from about 92 to 115% for 3 water matixes fortified at 0.05 and 0.5 µg/L. Average single-operator precision, over the course of 1 week, was better than 5%.

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