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A new index for assessing heavy metal contamination in sediments of the Beijing-Hangzhou Grand Canal (Zaozhuang Segment): A case study

机译：评估京杭大运河（枣庄段）沉积物中重金属污染的新指标：一个案例研究

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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. (C) 2016 Elsevier Ltd. All rights reserved.
机译：京杭大运河枣庄段是中国南水北调东线重要的输水管道，其水环境条件对引水水质安全有重要影响。本文分析了该区域表层沉积物中五种重金属的含量，例如镉，铜，镍，铅和锌，以及它们的化学形式。还采用了阈值影响水平-可能影响水平（TEL-PEL），风险评估代码（RAC）和酸挥发性硫化物同时提取金属（AVS-SEM）等方法来评估该地区的沉积环境质量。为了评估生态环境风险，揭示浓度，化学分馏，重金属的毒性信息，引入了一种新的评价指标，即多变量评价指标（MEI）。结果表明，表层沉积物中这五种重金属的含量普遍较低。总体而言，除了高风险地区以外，生态风险处于中低等级。但是，各种评估结果之间仍然存在某些差异。与其他单一评估方法相比，MEI可能能够更全面地反映特定区域沉积物中重金属的污染状况和生态风险。 MEI似乎也能够克服其他普遍使用的综合指标来评估水生系统潜在的泥沙污染风险。 （C）2016 Elsevier Ltd.保留所有权利。

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