Study on effective species of heavy metals in lacustrine sediment core from Xijiu Lake,Taihu Lake catchment,China |
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| Authors: | Zhaobin Sun Yanhong Wu Shuchun Yao Enfeng Liu Fuchun Li |
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| Institution: | (1) College of Resource and Environmental Science, Nanjing Agricultural University, 210095 Nanjing, China;(2) State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, 210008 Nanjing, China; |
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| Abstract: | The BCR sequential extraction procedure is applied to probe into the speciation distribution of heavy metals (Cd, Cr, Zn,
Cu and Pb) in lake sediments of Core XJ2 in Xijiu Lake, Taihu Lake catchment, China. The results showed that the effective
species concentration of this five heavy metal elements increased obviously during the past century, the proportions of organic/sulphide
fractions of Zn, Cu and Pb decreased while the Fe–Mn oxide fractions increased, and the proportion of Fe–Mn oxide fractions
of Cd decreased while the exchangeable and carbonate fractions increased. The concentrations of exchangeable and carbonate
fractions of these five elements were increased in the past century, especially the proportions of these fractions of Cd,
Zn, Cu and Pb increased prominently. These changes could be attributed to the anthropogenic pollution. Since the changes of
the heavy metal concentrations were corresponding to the history of human activities, especially the industry development,
within the catchment. |
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