Spatial Distribution and Pollution Assessment of Heavy Metals in River Sediments from Lake Taihu Basin

被引：17
|
作者：
Zhang J. [1 ,2 ]
Guo X.-Y. [1 ,2 ]
Zeng Y. [1 ,2 ]
Deng J.-C. [1 ]
机构：
[1] State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing
[2] University of Chinese Academy of Sciences, Beijing
来源：
Huanjing Kexue/Environmental Science | 2019年 / 40卷 / 05期
关键词：
Heavy metals; Lake Taihu Basin; Pollution assessment; Sediment; Source identification;
D O I：
10.13227/j.hjkx.201809168
中图分类号：
学科分类号：
摘要：
To clarify the pollution characteristics of heavy metals in the surface sediments of rivers in economically developed areas, analysis of the contents of eight heavy metals, assessment of ecological risks, and identification of the source of heavy metals in surface sediments from typical rivers of Lake Taihu Basin were carried out in this study. The results showed that the average contents of Zn, Cr, Ni, Cu, Pb, As, Cd, and Hg in the surface sediments of Lake Taihu Basin were 163.62, 102.46, 45.50, 44.71, 37.00, 13.34, 0.479, and 0.109 mg•kg-1, respectively. Except for Hg, the average contents of other 7 heavy metals were higher than their background values. The geo-accumulation index indicated that Pb, Ni, Zn, Cu, and Cd amount to a low pollution state. According to the pollution load index, Pb, Ni, Zn, and Cu represent a moderately polluted state, while Cd, Cr, and As a low degree pollution state. Based on the potential ecological risk index, Cd and Hg represent moderate potential ecological risk, and the others low potential ecological risk. Source identification of heavy metals by multivariate statistical analysis showed that Pb was largely from non-point pollutions; Cr, Ni, and Zn stemmed from electroplating, alloy manufacturing industries, and nature; Cu and As were mainly from pesticides and discharge of industrial wastewater; Cd was dominantly from smelting industry; and Hg was mainly derived from fossil fuel combustion and petroleum products. © 2019, Science Press. All right reserved.
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页码：2202 / 2210
页数：8
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