DETERMINATION OF ORGANOCHLORINE PESTICIDES IN WATER BY MEMBRANOUS SOLID-PHASE EXTRACTION, AND IN SEDIMENT BY MICROWAVE-ASSISTED SOLVENT-EXTRACTION WITH GAS-CHROMATOGRAPHY AND ELECTRON-CAPTURE AND MASS-SPECTROMETRIC DETECTION

C-18-impregnated disks for solid-phase extraction were evaluated for t he extraction of organochlorine pesticides (OCPs) from water samples, and stability of the pesticides in storage. Good recoveries from diffe rent water samples were obtained. Microwave-assisted solvent extractio n (MASE) was employed for the extraction of marine sediments spiked wi th OCPs. Factors affecting the efficiency of MASE were also investigat ed. Recoveries of 17 OCPs and 2 OCP surrogates were in the range 70.6- 93.1% with mean deviation between 2.0 to 8.0%.