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| Vertical pollution characteristics of sediments from lakes in middle reaches of Yangtze River |
| Received:October 22, 2015 |
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| KeyWord:core sediment;TOC;TN;heavy metal;correlation analysis;principal component analysis |
| Author Name | Affiliation | E-mail | | LUO Ming-ke | College of Chemical Engineering, Xiangtan University, Xiangtan 411105, China
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | | | TIAN Xue-da | College of Chemical Engineering, Xiangtan University, Xiangtan 411105, China | | | YU Hui | State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | yuhui@craes.org.cn | | YANG Chao | Policy Research Center for Environment and Economy, Ministry of Environmental Protection, Beijing 100029, China | | | NIU Yuan | State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | | | LIU Peng | College of Chemical Engineering, Xiangtan University, Xiangtan 411105, China
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | | | NIU Yong | State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | |
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| Abstract: |
| Sediment vertical pollution characteristics are important for understanding the history of lake pollution. Here sediments from Lake Donghu in Wuhan, Lake Haikou in Huangshi, and Lake Nanhu in Zhongxiang in the middle reaches of the Yangtze River were collected to reveal the variation patterns and the main pollution sources of pollutants. The vertical distributions of total organic carbon(TOC), total nitrogen(TN), and heavy metals(Zn, Cu, Ni, Cr, Pb) were examined. Results showed that:concentrations of TOC and TN increased rapidly from 10 to 30 cm depth of sediment, which was consistent with the environmental changes around the lakes. The maximum value of TOC concentrations appeared in Lake Haikou, while that of TN concentrations occurred in Lake Donghu. Zn, Cu and Pb were mainly influenced by human activities, while Cr was primarily derived from natural sources. The pollution of heavy metals decreased in order of Lake Donghu>Lake Haikou>Lake Nanhu. Correlation analysis and principal component analysis showed that pollution contributed by human activities was greater than that by natural sources in these three lakes. Nutrients and Pb were the common pollutants. Heavy metal pollution in the sediments of these three lakes was affected by multiple factors. These results would provide useful information for controlling lake pollution in this area. |
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