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| Speciation and Ecological Risk Assessment of Heavy Metals in Surficial Sediments of Liangshui River in Beijing |
| Received:February 02, 2015 |
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| KeyWord:Liangshui River;sediments;heavy metal speciation;particle size;ecological risk |
| Author Name | Affiliation | E-mail | | MENG Bo | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875 | | | LIU Jing-ling | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875 | jingling@bnu.edu.cn | | LI Yi | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875 | | | SHI Xuan | State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875 | |
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| Abstract: |
| The water environment problem of urban river with unconventional water sources is becoming more and more serious. To evaluate the ecological integrity of urban river, physical properties and heavy metal pollution characteristics of surficial sediments collected from Liangshui River in Beijing were studied. The BCR methodology was applied to measure speciation of heavy metals, and Hakanson's methodology was used to determine contamination degree and ecological risk of heavy metals:Cr, Cd, Cu, As and Zn. Results showed that average particle size of sediments decreased along the flow of Liangshui River. The presence of dams and gates played a profound role in reducing sediment particle sizes. The content of speciation of heavy metals in Liangshui River sediments followed an order of residual>> oxidizable > acid soluble> reducible fraction. The composite potential ecological risk index of Cr, Cd, Cu, As and Zn in Liangshui River showed that heavy metal pollution risk was relatively high(RI=396.952 on average). The potential risk of individual heavy metal(Eri value) revealed that Cd risk was the greatest in the upstream and midstream of Liangshui River, mainly from anthropogenic sources. At sediment particle size < 0.2 mm, the content of non-steady fractions of Cr, Cd, Cu, As and Zn increased with decreasing particle sizes. The content of heavy metals(As, Cd, Pb and Zn) was higher in urban reach than in rural reach sediments. |
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