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Environ Sci Pollut Res Int. 2018 Feb;25(4):3695-3707. doi: 10.1007/s11356-017-0680-0. Epub 2017 Nov 22.

Heavy metals in the surface sediments of lakes on the Tibetan Plateau, China.

Guo B1,2, Liu Y3,4,5,6, Zhang F7,8, Hou J7,8, Zhang H7,8, Li C1.

Author information

1
Key Laboratory of Alpine Ecology and Biodiversity, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, 100101, China.
2
University of Chinese Academy of Sciences, Colledge of Resources and Environment, Beijing, 10049, China.
3
Key Laboratory of Alpine Ecology and Biodiversity, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, 100101, China. yqliu@itpcas.ac.cn.
4
University of Chinese Academy of Sciences, Colledge of Resources and Environment, Beijing, 10049, China. yqliu@itpcas.ac.cn.
5
CAS Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing, 100101, China. yqliu@itpcas.ac.cn.
6
Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, 100101, China. yqliu@itpcas.ac.cn.
7
CAS Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing, 100101, China.
8
Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, 100101, China.

Abstract

Heavy metal contamination has affected many regions in the world, particularly the developing countries of Asia. We investigated 8 heavy metals (Cu, Zn, Cd, Pb, Cr, Co, Ni, and As) in the surface sediments of 18 lakes on the Tibetan Plateau. It was found that the distributions of the heavy metals showed no clear spatial pattern on the plateau. The results indicated that the mean concentrations of these metals in the sediment samples diminished as follows: Cr > As > Zn > Ni > Pb > Cu > Co > Cd. The results of geoaccumulation index (I geo) and potential ecological risk factor (E ir ) assessments showed that the sediments were moderately polluted by Cd and As, which posed much higher risks than the other metals. The values of the potential ecological risk index (RI) showed that lake Bieruoze Co has been severely polluted by heavy metals. Principal component analysis, hierarchical cluster analysis, and Pearson correlation analysis results indicated that the 8 heavy metals in the lake surface sediments of the Tibetan Plateau could be classified into four groups. Group 1 included Cu, Zn, Pb, Co, and Ni which were mainly derived from both natural and traffic sources. Group 2 included Cd which mainly originated from anthropogenic sources like alloying, electroplating, and dyeing industries and was transported to the Tibetan Plateau by atmospheric circulation. Group 3 included Cr and it might mainly generate from parent rocks of watersheds. The last Group (As) was mainly from manufacturing, living, and the striking deterioration of atmospheric environment of the West, Central Asia, and South Asia.

KEYWORDS:

Contamination indices; Ecological risk; Heavy metal; Sediments; Source

PMID:
29168132
DOI:
10.1007/s11356-017-0680-0
[Indexed for MEDLINE]

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