The determination of chlorophenoxyacetic acid herbicide residues was done with GC-ECD as pentafluorobenzyl derivatives. The herbicides were separated on a 3 Silar 10 CP column, which permits better resolution from interfering organic acids of environmental origin. The fortification study provides an 84#x2013;91 recovery for the water and sediment samples. The detection limits were established as 0.1 #x3BC;g/1 for the water and 1.0#x2013;1.5 ng/g for the sediment samples. The use of a 3Silar 10 CP packed column in the monitoring study as compared with a 1.5 OV-17 + 1.95 QF-1 one, shows the very small amount of contamination of the samples with these herbicide classes.
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