Dissolved trace elements and heavy metals from the shallow lakes in the middle and lower reaches of the Yangtze River region,China |
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| Authors: | Hui Liu Wei Li |
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| Institution: | (1) Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, 430074, People’s Republic of China;(2) Laboratory of Aquatic Plant Biology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan, 430074, People’s Republic of China;(3) Graduate School of the Chinese Academy of Sciences, Beijing, 100049, People’s Republic of China;(4) Hubei Key Laboratory of Wetland Evolution and Ecological Restoration, Wuhan, 430074, Hubei, People’s Republic of China; |
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| Abstract: | Dissolved trace elements and heavy metals of waters and sediments in the ten shallow lakes in the middle and lower reaches
of the Yangtze River region were determined to identify their composition and spatial distribution, and to assess the extent
of their environmentally detrimental effects by comparison with water and sediment quality guidelines. Results indicated that
As and Pb were the main pollutants in lake waters and Mn and Hg the potential ones, while As, Cu and Pb were the main pollutants
in lake sediments. Their spatial distribution indicated that Daye Lake was seriously polluted by metals, which was corroborated
by cluster analysis. Higher concentrations of trace elements have been found in lakes downstream of the Yangtze River delta,
and higher concentrations of metals have been recorded in sediments of upstream lakes, suggesting that metals in water were
more sensitive to anthropogenic activities and that metals in sediment were mainly controlled by minerals. Correlation analyses
demonstrated that there were stronger associations among metals in lake sediments than those in lake waters, and their good
relationships suggested the common sources. Further research on the subject will help develop water quality management with
the aim of restoring shallow lakes in the Yangtze River. |
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