Gas chromatographic determination of acid herbicides in surface water samples with electron-capture detection and mass spectrometric confirmation
Abstract The development of a multi-residue method for the determination of eight polar acidic herbicides (MCPA, MCPB, mecocrop, 2,4-D, dichlorprop, bentazone, dicamba and dikegulac) in surface water is described. The method involves an off-line solid-phase extraction (SPE) procedure prior to instrumental analysis. The herbicides are isolated on an SPEC C 18 column and derivatized with pentafluorobenzyl bromide. After clean-up of the obtained solution on a disposable silica gel cartridge, the herbicide derivatives are determined by capillary gas chromatography with electron-capture detection and confirmed by capillary gas chromatography with mass selective detection using negative chemical ionization. The detection limits for the herbicides are in the range of 0.02–0.05 μg per litre surface water. The average recovery is 93%. A few hundreds of water samples were successfully analysed with this method.
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