Distribution,speciation and ecological risk assessment of heavy metals in the surface sediments of Sanmen Bay in Zhejiang

ZHAO Chen-hui; HU Ji; LIU Xiao-ya; CHEN Wen-shen; CAI Xiao-xia; ZHANG Hai-feng; YU Pei-song; PAN Jian-ming; ZHANG Hai-sheng

doi:10.3969/j.issn.1001-909X.2018.02.009

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Journal of Marine Sciences ›› 2018, Vol. 36 ›› Issue (2) : 64-73. DOI: 10.3969/j.issn.1001-909X.2018.02.009

Distribution,speciation and ecological risk assessment of heavy metals in the surface sediments of Sanmen Bay in Zhejiang

ZHAO Chen-hui^1,2, HU Ji^1,2, LIU Xiao-ya^1,2, CHEN Wen-shen^1,2, CAI Xiao-xia^1,2, ZHANG Hai-feng^1,2, YU Pei-song^1,2, PAN Jian-ming^1,2, ZHANG Hai-sheng^*1,2

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Abstract

Surface sediment samples were collected from Sanmen Bay in Zhejiang Province. The distribution of total concentration of five heavy metals (Zinc, Chromium, Cadmium, Copper, and Lead) was determined, and their speciation was investigated using BCR extraction method. The pollution level and ecological hazard of these heavy metals were evaluated with three methods: Potential Ecological Risk Index (Eⁱ_r), Risk Assessment Code (RAC), Ratio of Secondary and Primary Phase (RSP). The distribution of five metals show that the total concentrations in inner bay are higher than those out of the bay. The results of metal speciation in surface sediment show that the residual fraction of four metals are predominated except for Pb, of which Zn accounts for 79.20%~84.25%, Cr accounts for 93.24%~96.16%, Cd accounts for 34.71%~57.58%, and Cu accounts for 66.06%~79.51%, respectively. The dominated fraction of Pb is the part bounded to amorphous Fe and Mn oxides and hydroxides, which accounts for 56.58%~76.44%. The evaluation results indicate that Cd is the primary element in the area according to Potential Ecological Risk Index, and which is consistent with that by the Risk Assessment Code method. However, Pb is evaluated to be the primary element with potential ecological threat according to the Ratio of Secondary and Primary Phase, and followed by Cd.

Key words

Sanmen Bay / heavy metal / speciation / BCR method / ecological risk assessment

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ZHAO Chen-hui, HU Ji, LIU Xiao-ya, CHEN Wen-shen, CAI Xiao-xia, ZHANG Hai-feng, YU Pei-song, PAN Jian-ming, ZHANG Hai-sheng. Distribution,speciation and ecological risk assessment of heavy metals in the surface sediments of Sanmen Bay in Zhejiang[J]. Journal of Marine Sciences. 2018, 36(2): 64-73 https://doi.org/10.3969/j.issn.1001-909X.2018.02.009

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