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SPECIATION AND ASSESSMENT OF HEAVY METAL IN SEDIMENTS FROM A TYPICAL MARICULTURE BASE IN GUANGDONG COAST, CHINA

文献类型： 外文期刊

作者： Gu, Yangguang 1 ; Lin, Qin 1 ; Yang, Yufeng 2 ; Jiang, Shijun 2 ; Wang, Zenghuan 1 ; Wang, Xunuo 1 ;

作者机构： 1.Chinese Acad Fishery Sci, S China Sea Fisheries Res Inst, Guangzhou 510300, Guangdong, Peoples R China

2.Jinan Univ, Inst Hydrobiol, Guangzhou 510632, Guangdong, Peoples R China

关键词： Heavy metal;speciation;sediments;assessment;principal component analysis

期刊名称：FRESENIUS ENVIRONMENTAL BULLETIN （ 影响因子：0.489； 五年影响因子：0.479 ）

ISSN： 1018-4619

年卷期： 2011 年 20 卷 12A 期

页码：

收录情况： SCI

摘要： Nan'ao Island is one of Guangdong's largest mariculture bases in south China. The speciation of heavy metals (Cr, Ni, Cu, Zn, Cd, Pb) in surface sediments (phi <= 5 63 mu m) were studied with the 3-stage sequential extraction procedure proposed by the European Community Bureau of Reference (BCR). The total heavy metals and residual fraction were undertaken by microwave-assisted acid digestion. Cadmium (Cd) and Pb exhibited greatest labile fractions (acid soluble fraction+reducible fraction+oxidizable fraction), indicating anthropogenic origin. Chromium (Cr) and Ni were mainly present in residual fraction, and thus considered an indicator of natural sources; while Cu and Zn had comparable amount of labile fractions and residual fraction, implying a combination of anthropogenic and natural sources. Cadmium was associated with acid soluble fraction and Pb with the reducible fraction. A Principal component analysis (PCA) revealed three groupings (Cd; Cr, Ni and Cu; Pb and Zn) that mainly result from different distributions of the metals in the various fractions. Enrichment factor (EF) analysis indicated that heavy metals were minor contaminants, though metals appeared more enriched in the fish cage culture areas than other mariculture types due to closer vicinity to human residences. Risk assessment code analysis indicated that Cd was in high/very high risk category, while Pb, Ni and Cu in low risk category; Cr was in no risk category and Zn posed medium risk to aquatic environment.

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