Determination of nine acidic herbicides in water and soil by gas chromatograpy using an electron-capture detector

Add time:09/10/2019    Source:sciencedirect.com

Two simple and convenient methods are described for the extraction, analysis and clean-up of nine acidic herbicides in water and soil samples. The extracted acidic herbicides were converted into their methyl esters by a modified method using diazomethane. The methylated herbicides were analyzed by gas chromatography with electron-capture detection using a Restek Rtx-35 0.53 mm I.D. capillary column and simultaneously confirmed using an Rtx-5 capillary column. A simple clean-up procedure using a micro disposable Florisil column in also described. The mean recoveries for all herbicides from water were >95% and from soils >86%. The recoveries of herbicides after Florisil column clean-up were greater than 89%. Each sample run required about 25 min, including confirmation. The methods described are suitable as an initial screening procedure in the rapid simultaneous determination of nine acidic herbicides in large numbers of environmental samples at reasonable cost.

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