Abstract
The use of C 18 and styrene—divinylbenzene (ST-DVB) Empore extraction disks for trace-enrichment and determination of the stability of various pesticides in water samples is shown. The influence of the water type and of matrix interferences in the determination of pesticides at the 0.02–1 μg/l level is discussed. Impurities generated by the matrix and the sorbent of the disk have been identified by gas chromatography—mass spectrometry (GC-MS) and their concentrations have been compared with impurities found when using conventional extraction cartridges. For the extraction of acidic herbicides the levels of interferences at pH 1 have been investigated. The recoveries obtained with the Empore disks and with conventional liquid—liquid extraction (LLE) are compared. Finally examples of stability studies of pesticides enriched in the disk materials are given.
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