Heavy metal pollution, ecological risk, spatial distribution, and source identification in sediments of the Lijiang River, China

被引:178
作者
Xiao, He [1 ]
Shahab, Asfandyar [1 ]
Xi, Beidou [1 ,2 ]
Chang, Qixin [3 ]
You, Shaohong [1 ]
Li, Jieyue [1 ]
Sun, Xiaojie [1 ]
Huang, Hongwei [1 ]
Li, Xiangkui [1 ]
机构
[1] Guilin Univ Technol, Coll Environm Sci & Engn, Guilin 541004, Peoples R China
[2] Chinese Res Inst Environm Sci, Key Lab Environm Criteria & Risk Assessment, Beijing 100012, Peoples R China
[3] Chengdu Univ Technol, Coll Environm & Civil Engn, Chengdu 610059, Peoples R China
基金
国家重点研发计划;
关键词
Lijiang river sediments; Heavy metal; Pollution indices; Source identification; RECLAMATION-AFFECTED RIVERS; SURFACE SEDIMENTS; SOURCE APPORTIONMENT; ENVIRONMENTAL RISK; TRACE-ELEMENTS; CONTAMINATION; SOILS; URBAN; ESTUARY; WATER;
D O I
10.1016/j.envpol.2020.116189
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The Lijiang River is of great ecological and environmental importance for Guilin City, which is located in the karst area of southeast China. Given its importance, a detailed evaluation of the heavy metals (HMs) in the river sediment is required. For the first time, 61 sediment samples were collected along the entire Lijiang River to determine pollution level and ecological risk posed by 10 HMs (Co, Cr, Cu, Mn, Ni, Pb, Zn, As, Hg, and Cd). These were assessed using the geo-accumulation index, potential ecological risk index, and modified degree of contamination. The results showed that the mean concentrations of the majority of HMs exceeded their corresponding background values and followed the trend: midstream > downstream > upstream. Based on the spatial distributions and pollution indices of the 10 HMs, the Lijiang River was found to have a high accumulation of Cd, Hg, Zn, and Pb in the sediments. The midstream area was the most polluted with respect to Cd and Hg, and also posed a relatively higher potential ecological risk than the downstream and upstream areas. The sources of the assessed HMs were inferred based on a correlation analysis and principal component analysis, which identified both natural and anthropogenic sources. A higher pollution potential was associated with Cd, Hg, Pb, and Zn in the midstream and downstream areas due to higher organic and carbonate content, urbanization, agricultural activities, and leisure activities (e.g., boating and cruises). In contrast, natural erosion and weathering processes were responsible for the HM concentrations in the upstream area. The findings of this study will help the local authorities to protect the important water resource of the Lijiang River. (C) 2020 Elsevier Ltd. All rights reserved.
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页数:10
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