Oyster copper levels in the northern South China Sea from 1989 to 2015: spatiotemporal trend detection and human health implications

文献类型： 外文期刊

第一作者： Wang, Lifei

作者： Wang, Lifei;Wang, Xuefeng;Wang, Lifei;Wang, Xuefeng;Chen, Haigang;Wang, Zenghuan;Jia, Xiaoping

作者机构：

关键词： Environmental protection; Health risk assessment; Heavy metal contamination; Oyster copper concentration; Seafood safety; Spatiotemporal distributions

期刊名称：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH （ 影响因子：4.223； 五年影响因子：4.306 ）

ISSN： 0944-1344

年卷期： 2020 年 27 卷 30 期

页码：

收录情况： SCI

摘要： Coastal heavy metal pollution has become an important topic for seafood safety and marine environmental protection. Unlike toxic heavy metals such as cadmium or chromium, copper is essential for oysters' growth but can inhibit their immune response to exotic stress when going above normal levels. Oysters with high copper levels can easily accumulate and transfer abnormal amounts of copper to upper trophic levels, and generate health risks for humans. This study investigated the spatiotemporal variability and health risk of copper levels in cultured oysters (Crassostrea rivularis) sampled from 23 harbors, bays, or estuaries along the northern South China Sea during 1989-2015. Overall, oyster copper concentrations in the study area ranged from 0.9 to 1897.0 mu g/g wet weight with a mean of 210.0 (+/- 143.6) mu g/g and a median of 89.3 mu g/g. Although oyster copper levels in the southern China provinces of Guangdong, Guangxi, and Hainan showed an overall decrease during 1989-2015, they stayed relatively low since 1996 and increased slightly after 2010. Oyster copper levels in Guangdong were significantly higher than in Hainan and Guangxi. In Guangdong, oyster copper levels were highest in the Pearl River Estuary, followed by west Guangdong and east Guangdong. The health risk of copper exposure through oyster consumption increased in 2011-2015 compared with in 2006-2010. It is recommended that the human daily intake of cultured oysters in the study area should be reduced by half to minimize copper exposure. This study suggested that copper is one of the most important heavy metal contaminants in coastal and estuarine ecosystems of the northern South China Sea.

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