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The distribution and speciation of trace metals in surface sediments from the Pearl River Estuary and the Daya Bay, Southern China |
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| Authors: | Xiujuan Yu Yan Yan Wen-Xiong Wang |
| Affiliation: | a South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China b Key Laboratory of Marine Bio-Resources Sustainable Utilization, Key Laboratory of Tropical Marine Environmental Dynamics, Marine Biology Research Station at Daya Bay, Chinese Academy of Sciences, China c Department of Biology, The Hong Kong University of Science and Technology (HKUST), Clear Water Bay, Kowloon, Hong Kong |
| Abstract: | Surface sediments collected from the Pearl River Estuary (PRE) and the Daya Bay (DYB) were analyzed for total metal concentrations and chemical phase partitioning. The total concentrations of Cr, Cu, Ni, Pb, and Zn in the PRE were obviously higher than those in DYB. The maximum concentrations of trace metals in DYB occurred in the four sub-basins, especially in Dapeng Cove, while the concentrations of these metals in the western side of the PRE were higher than those in the east side. Such distribution pattern was primarily due to the different hydraulic conditions and inputs of anthropogenic trace metals. The chemical partitioning of metals analyzed by the BCR sequential extraction method showed that Cr, Ni, and Zn of both areas were present dominantly in the residual fraction, while Pb was found mostly in the non-residual fractions. The partitioning of Cu showed a significant difference between the two areas. |
| Keywords: | Sediment Trace metal Sequential extraction Pearl River Estuary Daya Bay |
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