Distribution Characteristics and Risk Assessment of Heavy Metals in the Source Region of Yangtze River

被引：0
|
作者：
Qiao S. [1 ,2 ]
Wang T. [2 ]
Zhang Q. [1 ,2 ]
Liu X. [1 ,2 ]
Zhao M. [1 ,2 ]
机构：
[1] School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen
[2] Beijing New Advanced Treatment Technology Research Center, Department of Environmental Engineering, Peking University, Beijing
来源：
Beijing Daxue Xuebao (Ziran Kexue Ban)/Acta Scientiarum Naturalium Universitatis Pekinensis | 2022年 / 58卷 / 02期
关键词：
Ecological risk; Heavy metal; Source region of Yangtze River; Spatial and temporal distribution;
D O I：
10.13209/j.0479-8023.2022.007
中图分类号：
学科分类号：
摘要：
Water and sediment samples in twelve monitoring sites were collected in the source region of Yangtze River in June 2017, followed by the content detection of seven metal ions, and assessment of pollution level and ecological risk with the consideration of geo-accumulation index, water quality index, and potential ecological risk index. As results, the concentrations of Mn, Ni, Cu, Zn, Cd, Pb, and Cr in water ranged among ND-4.21, 0.609-3.71, 0.033-5.01, ND-34.86, ND-0.06, ND-0.55 and 0.235-2.66 μg/L respectively, which were rather low compared with other aquatic systems. Their contents in sediment were in the range of 445.93-627.32, 10.11-17.85, 15.61-24.57, 45.40-125.20, 0.19-0.56, 14.85-235.21, and 27.94-46.18 mg/kg. Metal contents in sediment were dominated by background value, and barely impacted by physicochemical factors. Whereas natural or anthropogenic factors, such as NH4-N, NO3-N, SS and water temperature, displayed certain influence on ion contents in water according to correlation analysis. Results by water quality and risk assessment suggested that water quality in the source region of Yangtze River was excellent. The sediments at higher altitude area presented certain metal accumulation especially Zn, Pb, and Cd, which was perhaps due to the adjacent Pb-Zn deposits. Cd was the key factor that contributes to the potential ecological risk of sediment in the Yangtze River source. Overall, this study can fill in the gap of lacking detecting data at headwater, and provide a theoretical basis for the pollution prevention and control of heavy metals even in the whole Yangtze River basin. © 2022 Peking University.
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页码：297 / 307
页数：10
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