OCCURRENCE OF POLYCHLORINATED BIPHENYLS IN SEAWATER, SEDIMENT AND SHELLFISH FROM OFFSHORE MIXED-AQUACULTURE PONDS IN TAIZHOU, CHINA

摘要

The concentrations of polychlorinated biphenyls (PCBs) in seawater, sediment and shellfish (Mactra veneriformis, Tegillarca granosa, Sinonovacula constricta) samples collected from mixed-aquaculture ponds near an electronic waste recycling site in Taizhou, China were quantified. The average concentrations of ΣPCBs (sum of 10 PCB congeners) were 17.75±8.54 ng/L, 14.91±8.84 ng/g, 2.75±1.17 ng/g, 3.31 ±1.93 ng/g, and 3.75±1.16 ng/g in seawater, sediment, Mactra veneriformis, Tegillarca granosa and Sinonovacula constricta, respectively. The sediments were contaminated with hexachlorobiphenyls, which accounted for 28.16-49.15% of ΣPCBs (average 42.34%). When the shellfish were evaluated, hexachlorobiphenyls were found to account for 44.57-58.16% of ΣPCBs in Mactra veneriformis, 27.56-39.51% in Tegillarca granosa and 26.55-53.89% in Sinonovacula constricta, respectively. In addition, concentrations of PCB28, PCB 118 and PCB 153 in seawater were found to be positively correlated with those in sediments. Furthermore, the concentrations of PCB28, PCB52, PCB 112, PCB 118, and PCB 153 in sediments were found to be linearly correlated with the concentrations in shellfish, indicating that these contaminants originated from a common source.