Enormous PCBs increase in oysters from the coast of Guangdong, China |
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| Authors: | Gan Ju-Li Jia Xiao-Ping Jia Ting Lin Qin Cai Wen-Gui |
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| Institution: | a South China Sea Fisheries Research Institute, Chinese Academy of Fishery Science, No. 231 Xin Gang Xi Road, Guangzhou, Guangdong 510300, China
b Weill Graduate School of Cornell University, New York, NY 10021, USA |
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| Abstract: | PCBs equivalent to Aroclor 1242 and 1254 in soft tissues of oysters Crassostrea rivularis from the Guangdong coast, China, were measured using a GC-ECD. PCB concentrations (ng g−1 d.w.) ranged from 30 to 2040 with an average of 315 in 2003-2007, and 0.35-1.43 with an average of 0.56 in 1989-1991. Annual averages were 0.61, 0.65, 313, 290 and 342 ng g−1, respectively in 1989, 1991, 2003, 2006 and 2007. In east Guangdong, the Pearl River Estuary, and west Guangdong, regional means were 444, 273, 194 ng g−1, respectively in 2003-2007, and 0.43, 0.78, 0.38 ng g−1, respectively in 1989-1991, indicating PCB levels in oysters have risen greatly by ratios of 350-1032 compared with earlier data. PCB sources may derive from older transformers, printing materials and pressworks. Fortunately, current residual PCBs in the oysters were 0.004-0.253 mg kg−1 (w.w.), still below hygienic criteria of China and developed countries. |
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| Keywords: | South China Coastal waters Oyster PCBs Spatial distribution Temporal trends |
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