MULTIRESIDUE-MATRIX SOLID-PHASE DISPERSION METHOD FOR DETERMINING 16 ORGANOCHLORINE PESTICIDES AND POLYCHLORINATED-BIPHENYLS IN FISH

An effective, multiresidue-matrix, solid-phase dispersion - extraction (MSPD) and GC-MS method for the determination of 16 organochlorine pesticides (OCPs), as well as polychlorinated biphenyls (PCBs) from the level chlorination in fish is described. The method uses an octadecylsilyl-derivatized silica and Florisil-based MSPD co-column for direct, on-line clean-up. Recoveries calculated from five different fortification levels are > 85 % in all cases for OCPs, except for heptachlor and 4,4'-DDT where recoveries of 78 % and 81 % are ob-tained, and > 95 % for PCBs. Detection limits determined for the OCPs vary from 19.6-91.1 ng g(-1), and from 71.4 - 111.2 ng g(-1) for the two to five chlorine-containing PCBs. The method has been applied to the analysis of fish grown in Er-Jen river (Taiwan) and method may serve as a screening protocol for the determination of OCPs and PCBs in fish.