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| DOI：10.13522/j.cnki.ggps.2017.0252 |
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| Assessing Contents and Pollution of Heavy Metals within the Sediment Deposits in the Main Streams of the Three Gorges Reservoir |
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ZHANG Weijie, XU Jianxin
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North China Institute of Water Conservancy and Hydroelectric Power, Zhengzhou 450045, China
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| Abstract: |
| 【Objective】 Heavy metals in sediment deposits is a concern in study of ecology and environment of river and reservoir, and the purpose of this paper is to present the results of an experimental study on the mass fraction and potential contamination of heavy metals in the sediments in the main streams of the Three Gorges Reservoir. 【Method】 Samples in surface sediment deposits were taken from 37 locations in the region of the Three Gorges Reservoir in June 2015. Inductively coupled plasma source mass spectrometer (ICP-MS) was used to analyse the mass fraction of the heavy metals in the samples. Their contamination potential was evaluated using the geo-accumulation index and the potential ecological risk assessment method. 【Result】 The average mass fraction of Cr, Ni, Cu, Zn, As, Cd and Pb in the sediments of the main streams was 106.14 mg/kg, 42.44 mg/kg, 60.54 mg/kg, 151.21 mg/kg, 12.15 mg/kg, 0.92 mg/kg, 54.39 mg/kg, 0.12 mg/kg, respectively, higher than the background values in the sediments of the Yangtze River. The mass fraction of Ni, Cu, Pb and As showed an increasing trend from the upstream to the downstream; the content of Zn, Cd and Hg was higher at their sources and then decreased before increasing again along the stream. The distribution of Cr was relatively uniform except at several specific locations. There was a moderate Cd pollution in the upstream and midstream, while the pollution caused by Pb was minor. The accumulation of Cu and Zn could lead to a pollution to the downstream, and Cr, As and Ni resulted in pollution only at some specific locations. 【Conclusion】 Overall, Cd pollution is a concern and should be paid an attention. |
| Key words: Three Gorges Reservoir; heavy metals; pollution assessment |
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