Bioaccumulation and human health implications of trace metals in oysters from coastal areas of China.

This study recompiled a national dataset to characterize the pollution level and health risk of cadmium (Cd), copper (Cu), lead (Pb) and zinc (Zn) in oysters along the coastal areas of China. Results showed that the median concentrations of Cd, Cu, Pb and Zn in nationwide oysters were 5.5, 335, 1.3 and 1280 mg/kg dry weight, respectively. Generally, oysters from the north coasts presented lower metal pollution and higher quality than those from the south. The regional characteristics of trace metals in oysters might be contributed by the interspecific differences. Nationally, the noncarcinogenic risk posed by these four metals in oysters was relatively low, with the risk only occurring in a few hotspots such as the Pearl River Estuary and the Jiulong River Estuary. However, more attention should be paid to the carcinogenic risk of Cd, and priority should be given to formulating control measures to mitigate Cd pollution. [Display omitted] • A dataset of trace metals in oysters from 274 sites along Chinese coasts was recompiled. • Hotspots of metal pollution and associated human health risk in oysters were identified. • Trace metals in oysters nationwide did not pose widespread noncarcinogenic risk. • The human carcinogenic risk of cadmium in oysters nationwide should not be ignored. [ABSTRACT FROM AUTHOR]