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| Pollution history and potential ecological risk assessment of heavy metals in core sediments in Hulun Lake during the past 150 years |
| Received:August 22, 2017 |
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| KeyWord:heavy metals;sediments;sources;risk assessment;Hulun Lake |
| Author Name | Affiliation | E-mail | | SUN De-yao | Key Laboratory of Geographical Resources and Environmental Remote Sensing, Harbin Normal University, Harbin 150025, China | | | ZANG Shu-ying | Key Laboratory of Geographical Resources and Environmental Remote Sensing, Harbin Normal University, Harbin 150025, China | | | SUN Hua-jie | Key Laboratory of Geographical Resources and Environmental Remote Sensing, Harbin Normal University, Harbin 150025, China | | | ZHANG Nan-nan | Key Laboratory of Geographical Resources and Environmental Remote Sensing, Harbin Normal University, Harbin 150025, China | | | ZHANG Ke | Key Laboratory of Geographical Resources and Environmental Remote Sensing, Harbin Normal University, Harbin 150025, China | | | SUN Li | Key Laboratory of Geographical Resources and Environmental Remote Sensing, Harbin Normal University, Harbin 150025, China | sunli_wabb@163.com |
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| Abstract: |
| Understanding the evolution process of the historical environment is the foundation of lake ecosystem restoration. Heavy metals of Cr, Mn, Co, Cu, Zn, Cd, As, and Pb, fine particle sizes of clay, as well as 210Pb dating data were measured in the central core sediments of Hulun Lake, due to the scarce research of its historical pollution characteristics. The vertical distribution, possible sources, and potential ecological risk assessment of heavy metals were investigated using Pearson correlation analysis and principal component analysis. Results showed that the contents of all heavy metals were relatively low, and were derived from a natural input source from 1865-1973. Heavy metal concentrations increased from 1973-1992, while after 1994, all metals except for As and Pb showed a decreasing tendency with regard to the sources of natural and anthropogenic input. Single element pollution coefficients were in the order of Cd > As > Pb > Cu > Co > Cr > Mn > Zn, with the major and harmful ecological risk factors being mainly from Cd and As. The pollution coefficient of As ranged from 30~60 after 1992, which indicated a medium potential ecological risk, while other metals were minor ecological hazards. Therefore, heavy metals in the core sediments of Hulun Lake had potential risks, and appropriate attention must be paid to the pollution control of the lake. The current study can provide reference and basic data for the improvement of the ecological environment in Hulun Lake. |
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