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| Distribution of Heavy Metals in Water-Sediment System of Hulun Lake, China |
| Received:June 11, 2014 |
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| KeyWord:Hulun Lake;water-sediment system;heavy metal;forms |
| Author Name | Affiliation | E-mail | | Dudagula | College of Environment and Resources, Inner Mongolia University, Hohhot 010021, China
Inner Mongolia Environment Monitoring Center Station, Hohhot 010011, China | | | HE Jiang | College of Environment and Resources, Inner Mongolia University, Hohhot 010021, China
Institute of Environmental Geology, Inner Mongolia University, Hohhot 010021, China | ndjhe@imu.edu.cn | | LÜ Chang-wei | College of Environment and Resources, Inner Mongolia University, Hohhot 010021, China
Institute of Environmental Geology, Inner Mongolia University, Hohhot 010021, China | | | XIE Zhi-lei | College of Environment and Resources, Inner Mongolia University, Hohhot 010021, China | | | LI Yun-fei | College of Environment and Resources, Inner Mongolia University, Hohhot 010021, China | | | DING Tao | College of Environment and Resources, Inner Mongolia University, Hohhot 010021, China | |
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| Abstract: |
| In this work, the Tessier sequential extraction method was selected to extract Cu, Pb, Zn and Cd forms in the surface sediments from Hulun Lake, China. Concentrations of Cu, Pb, Zn and Cd in the overlying water and its filtrate and the pore water were also determined. The results showed that the average concentrations of Cu, Pb, Zn and Cd in the pore water were 4.79, 1.02, 2.18 times and 2.08 times as much as those in the filtered water, respectively. This revealed that Zn and Cd, especially Cu had a remarkable migration from the pore water to the overlying water. Higher heavy metals in the overlying water than in the filtrate indicated that heavy metals were combined with suspended particulars, implying the role of the suspended particulars to self-purify Cu, Zn and Cd, especially Pb, in lake water. Compared with Cu and Zn, the carbonates and exchangeable forms of Pb and Cd had tended to enrich in secondary phases. The percentage of Cd in the secondary phase is higher than the other three heavy metals. Cadmium and Pb in the surface sediments might have high ecological risk when environmental conditions especially pH changes. Our results suggest that keeping a weakly alkaline condition of lake water is critical to health and ecological safety of Hulun Lake. |
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