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Distribution and ecological assessment of heavy metals in irrigation channel sediments in a typical rural area of south China

文献类型： 外文期刊

作者： Gu, Chiming 1 ; Liu, Yi 1 ; Liu, Dongbi 3 ; Li, Zhiguo 1 ; Mohamed, Ibrahim 1 ; Zhang, Ronghua 4 ; Brooks, Margot 7 ; Che 1 ;

作者机构： 1.Chinese Acad Sci, Wuhan Bot Garden, Lab Aquat Bot & Watershed Ecol, Wuhan 430074, Peoples R China

2.Univ Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China

3.Hubei Acad Agr Sci, Inst Plant Protect & Soil Fertilizer, Wuhan 430064, Peoples R China

4.Wuhan Vegetable Res Inst, Wuhan 430065, Peoples R China

5.Banha Univ, Fac Agr, Dept Soil Sci, Kalyoubia 13736, Banha, Egypt

6.China Program Int Plant Nutr Inst, Wuhan 430074, Peoples R China

7.Rhodes Univ, Dept Biochem & Microbiol, ZA-6140 Grahamstown, South Africa

关键词： Contamination evaluation;Heavy metal;Pollution load index;Potential ecological risk index

期刊名称：ECOLOGICAL ENGINEERING （ 影响因子：4.035； 五年影响因子：4.611 ）

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收录情况： SCI

摘要： Elevated levels of heavy metals in sediments of irrigation channels can pose risks for crops and livestock, as well as for human health. In this study sediment samples were collected from the irrigation channel in a typical rural area of south China, and digested, in order to analyze their contents for the presence of heavy metals Cu, Zn, Pb, Cr, Cd, and Ni, as well as the non-metal As, to assess total concentrations and pollution levels. The pollution load index and potential ecological risk index of these elements were utilized to assess contamination levels and ecotoxicity. Our results showed that the concentrations of the 7 elements were in the order of Zn > Ni > Cr > Cu > As > Pb > Cd. With the exception of Cr and Pb, concentrations of elements were higher than their background in soil, especially for Cd (1.79 mg kg(-1)), As (99.61 mg kg(-1)) and Ni (142.62 mg kg(-1)), which were 18.49, 8.89 and 5.30 times their background concentrations, respectively. The whole sampled zone was characterized by medium pollution and had a very high potential ecological risk. The area of arable land presented a medium pollution risk, while areas near to the path or road showed high risk of pollution. The predominant contributors to elevated ecological risk for the whole zone were Cd and As. (C) 2016 Elsevier B.V. All rights reserved.

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