Abstract
Residues of DDT and its metabolites, hexachlorocyclohexanes (HCHs), chlordane, toxaphene, polychlorinated biphenyls (PCBs), and hexachlorobenzene (HCB) were determined by GC ECD and GC MS in the blubber of a seal ( Phoca caspica) from the coast of Iran on the Caspian Sea. The organochlorine pattern was dominated by DDT and its metabolites while PCBs (65 PCB congeners including non-ortho PCBs were quantified) only played a minor role. The high content of β-HCH determined by GC ECD and confirmed by GC MS was interpreted to be caused by local sources. On the other hand, residues of chlordane compounds were correlated to atmospheric long-range transport.
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