Abstract
A rapid procedure for the determination of two herbicides in environmental water samples is described. The method makes use of the potential of coupled-column liquid chromatography for the trace determination of polar compounds by direct large-volume injection of aqueous samples. With direct injection of 2000-μl samples, detection limits down to 0.1 μg/l and an analysis time of about 10 min can be achieved, rendering an overall procedure with a throughput of 50 samples per day. Drinking and surface water samples spiked at levels between 0.2 and 1 μg/l yielded average recoveries between 83–107% ( n = 5) with relative standard deviations between 3–8%. The calibration graphs are linear over at least three orders of magnitude.
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