A new index for assessing heavy metal contamination in sediments of the Beijing-Hangzhou Grand Canal (Zaozhuang Segment): A case study |
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| Institution: | 1. College of City and Architecture Engineering, Zaozhuang University, Zaozhuang, Shandong 277160, China;2. College of Life Sciences, Zaozhuang University, Zaozhuang, Shandong 277160, China;3. Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, Shandong 264003, China;1. Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, 29 Zhongguancun East Road, Haidian District, Beijing 100190, China;2. Laboratoire Commun de Métrologie LNE-Cnam, 61 rue du Landy, F93210 La Plaine-Saint Denis, France;3. National Institute of Metrology, No. 18 Bei San Huan Dong Lu, Chaoyang District, Beijing 100029, China;1. Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai, Shandong 264003, China;2. College of City and Architecture Engineering, Zaozhuang University, Zaozhuang, Shandong 277160, China;3. University of Chinese Academy of Sciences, Beijing 100049, China;1. Department of Civil Engineering, Zhejiang University, Hangzhou 310058, China;2. Center for Real Estate Studying, Zhejiang University, Hangzhou 310058, China;1. Business School, Hohai University, Nanjing, 211100, China;2. Water Resources Economics Research Institute, Hohai University, Nanjing, 211100, China;3. Global Environment and Natural Resources Institute (GENRI) & Department of Geography and GeoInformation Science (GGS), College of Science, George Mason University, Fairfax, VA, 22030, USA |
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| Abstract: | Zaozhuang Segment of the Beijing-Hangzhou Grand Canal is an important water conveyance line on the eastern route of the South-North Water Transfer Project in China and its water environment condition can exert a significant influence on diversion water quality safety. This paper analyzed contents of five heavy metals such as Cd, Cu, Ni, Pb and Zn as well as their chemical forms in surface sediments in this region. Methods including Threshold Effects Level-Probable Effects Level (TEL-PEL), Risk Assessment Code (RAC) and Acid Volatile Sulfide- Simultaneously Extracted Metals (AVS-SEM) were also employed to evaluate the quality of sedimentary environment in this region. With the aim to assess the eco-environmental risk revealing the information of the concentration, the chemical fractionation, the toxicity of heavy metals, a new assessment index known as Multivariable Evaluation Index (MEI) was introduced into this paper. Results indicated that contents of such five heavy metals in surface sediments were generally low. Overall, ecological risk was in the medium-low grade in addition to several locations where the level of risk was high. However, certain differences still existed among various assessment results. Comparing with other single evaluation methods, MEI may be able to reflect contamination status and ecological risks of heavy metals in sediments of a specific region more comprehensively. MEI also seemed able to overcome the limitations of other prevalent aggregated indexes to assess potential sediment pollution risk in aquatic systems. |
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| Keywords: | Heavy metal Sediment New index Contamination The Beijing-Hangzhou Grand Canal |
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