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| Distribution Characteristics and Pollution Risk Assessment of Heavy Metals in Lhasa River Basin |
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Received:June 23, 2020
Revised:June 27, 2020
Accepted:June 29, 2020
Published Online:September 17, 2020
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| DOI：doi：10.3969/j.issn.1007-7545.2020.10.015 |
| KeyWord:Lhasa River Basin; heavy metal; comprehensive pollution index method; human activities |
| Author | Institution |
| QIN Huan-huan |
东华理工大学核资源与环境国家重点实验室 |
| GAO Bai |
东华理工大学水资源与环境工程学院 |
| HUANG Bi-xian |
东华理工大学水资源与环境工程学院 |
| ZHANG Shi-qian |
东华理工大学水资源与环境工程学院 |
| DONG Lei |
西藏自治区地质矿产勘查开发局第二地质大队 |
| SUN Zhan-xue |
东华理工大学核资源与环境国家重点实验室 |
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| Abstract: |
| Based on analysis of physical and chemical properties of water samples from 16 sampling points in the middle and lower reaches and Doilungqu tributary of Lhasa River Basin, content and distribution of main heavy metals in Lhasa River Basin were analyzed, and preliminary pollution risk assessment was evaluated by comprehensive pollution index method. The results show that content of As, Cd, Fe, Cu, Zn and Mn in Lhasa River Basin does not exceed the standard of class I water quality in environmental quality standard for surface water (GB3838—2002). There is no significant correlation between content of these six heavy metals and pH value, among which pollution of Cd, Cu and Mn has certain homology while pollution of As, Mn, Fe, Cu is multi-source. Comprehensive indexes of heavy metals pollution in middle and lower reaches, Doilungqu tributary and whole basin of Lhasa River Basin are 0.048, 0.192, 0.072 and 0.117, respectively. The pollution degree classification of all these reaches is non-pollution. Due to more intensive human activities, heavy metal pollution index in the lower reach of Lhasa River Basin is significantly higher than that in the middle reach and Doilungqu tributary. |
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