GIS spatial distribution and ecological risk assessment of heavy metals in surface sediments of shallow lakes in Jiangsu province

被引：1
作者：
Li Y.-J. [1 ,2 ]
Zhang L.-Y. [1 ]
Wu Y.-W. [1 ,3 ]
Li C.-L. [1 ]
Yang T.-X. [1 ]
Tang J. [1 ]
机构：
[1] State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing
[2] College of Resource and Environmental Engineering, Wuhan University of Technology, Wuhan
[3] CNHOMELAND Environmental Protection Water Pollution Governance Academician Workstation, Guangzhou
来源：
Huanjing Kexue/Environmental Science | 2016年 / 37卷 / 04期
关键词：
Ecological risk assessment; GIS; Heavy metals; Shallow lakes; Surface sediments;
D O I：
10.13227/j.hjkx.2016.04.017
中图分类号：
学科分类号：
摘要：
To understand pollution of heavy metals in surface sediments of shallow lakes, surface sediments samples of 11 lakes in Jiangsu province were collected to determine the content of six heavy metals including As, Cr, Cu, Pb, Zn and Ni. GIS was used to analyze the spatial distribution of heavy metals, and geological accumulation index (Igeo), modified contamination index (mCd), pollution load index (PLI) and potential ecological risk index (RI) were used to evaluate heavy metal contamination in the sediments. The results showed that: in the lakes' surface sediments, the average content of As, Cu, Zn, Cr, Pb, Ni in multiples of soil background of Jiangsu province were 1.74-3.85, 0.65-2.66, 0.48-3.56, 0.43-1.52, 0.02-1.49 and 0.12-1.42. According to the evaluation results of Igeo and RI, As, which had high degree of enrichment and great potential ecological risk, was the main pollutant, followed by Cu, and pollution of the rest of heavy metals was relatively light. Combining the results of several evaluation methods, in surface sediments of Sanjiu Lake, Gaoyou Lake and Shaobo Lake, these heavy metals had the most serious pollution, the maximum pollution loading and moderate potential ecological risk; in surface sediments of Gehu Lake, Baima Lake and Hongze Lake, some regions were polluted by certain metals, the overall trend of pollution was aggravating, the pollution loading was large, and the potential ecological risk reached moderate; in the other 5 lakes, the risk of sediments polluted by heavy metals, as well as the pollution loading, was small, and the overall was not polluted. © 2016, Science Press. All right reserved.
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页码：1321 / 1329
页数：8
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