Title：
Distribution and ecological assessment of heavy metals in irrigationchannel sediments in a typical rural area of south China
Authors：
Corresponding
Author：
Chiming Gu, Yi Liu, Dongbi Liu, Zhiguo Li, Ibrahim Mohamed, Ronghua Zhang,Margot Brooks, Fang Chen*
Pubyear：
2016
Title of
Journal：
Ecological Engineering
Paper
Code：
Volume：
90
Number：
Page：
466–472
Others：
Classification：
Source：
Abstract：
tElevated 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 channelin a typical rural area of south China, and digested, in order to analyze their contents for the presenceof heavy metals Cu, Zn, Pb, Cr, Cd, and Ni, as well as the non-metal As, to assess total concentrationsand pollution levels. The pollution load index and potential ecological risk index of these elements wereutilized to assess contamination levels and ecotoxicity. Our results showed that the concentrations ofthe 7 elements were in the order of Zn > Ni > Cr > Cu > As > Pb > Cd. With the exception of Cr and Pb, con-centrations 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 con-centrations, respectively. The whole sampled zone was characterized by medium pollution and had a veryhigh potential ecological risk. The area of arable land presented a medium pollution risk, while areas nearto the path or road showed high risk of pollution. The predominant contributors to elevated ecologicalrisk for the whole zone were Cd and As.
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