Geochemical features of heavy metals in core sediments of northwestern Taihu Lake, China

被引：0

作者：

Liu Enfeng ^{[1
,2
]}

Shen Ji ^{[1
]}

Liu Xingqi ^{[1
]}

机构：

[1] Chinese Acad Sci, Nanjing Inst Geog & Limnol, Nanjing 210008, Jiangsu, Peoples R China

[2] Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China

来源：

ACTA GEOCHIMICA | 2005年 / 24卷 / 01期

关键词：

heavy metal; chemical speciation; sequential core sediment; Taihu Lake;

D O I：

暂无

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Sequential core sediments from northwestern Taihu Lake in China were analyzed for grain size, organic carbon and heavy metal content. The sediments are composed of organic- poor clayey-fine silts. The chemical speciations of Cu, Fe, Mn, Ni, Pb, and Zn were also analyzed using the BCR sequential extraction procedure. Cu, Fe, Ni, and Zn are mainly associated with the residue fraction; Mn is concentrated mainly in exchangeable/carbonate fraction and residue fraction; and Pb mainly in Fe/Mn oxide fraction and organic/sulfide fraction. The exchangeable/carbonate fractions of Cu, Fe, Ni, Zn and Pb are lower. The fractions of Ni, Pb and Zn bound to the Fe/Mn oxide have significant correlations with reducible Mn; the organic/sulfide fractions of Cu, Mn, Ni, Pb, and Zn have significant correlations with TOC. The extraetable fractions of Cu, Mn, Ni, Pb, and Zn are high at the top 4 em of the core sediments as compared to those in the deeper layers, showing the anthropogenie input of heavy metals is due to rapid industrial development. The heavy metal pollution history of the sediments has been recorded since the late 1970s, determined by the result of 137Cs dating.

引用

页码：73 / 81

页数：9

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