The Risk Assessment of Sediment Heavy Metal Pollution in the East Dongting Lake WetlandReport as inadecuate




The Risk Assessment of Sediment Heavy Metal Pollution in the East Dongting Lake Wetland - Download this document for free, or read online. Document in PDF available to download.

Journal of Chemistry - Volume 2015 2015, Article ID 835487, 8 pages -

Research Article

Key Laboratory of Agroecological Processes in Subtropical Region, The Chinese Academy of Sciences, Changsha 410125, China

Dongting Lake Station for Wetland Ecosystem Research, Institute of Subtropical Agriculture, The Chinese Academy of Sciences, Changsha 410125, China

University of Chinese Academy of Sciences, Beijing 100049, China

Received 4 September 2014; Revised 7 January 2015; Accepted 11 January 2015

Academic Editor: Yongjun Gao

Copyright © 2015 Cong Hu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Total concentrations of cadmium Cd, lead Pb, chrome Cr, and nickel Ni in surface sediment 0–10 cm from the East Dongting Lake wetlands were determined and the spatial distribution of heavy metals was mapped. The results showed that the single risk indices of heavy metals were ranked in the order of Cd > Pb > Ni > Cr. The content of Cd and Pb was gradually reduced from the east Xiangjiang River to the west, while the Cr and Ni content had a patchy distribution pattern in the East Dongting Lake wetlands. Cd and Pb contents were correlated with soil pH significantly, while Cr and Ni contents were correlated with soil organic carbon SOC and total nitrogen TN. The origination of heavy metal Cd, Cr, Ni, and Pb could be divided into two groups: Cd and Pb from anthropogenic source and Cr and Ni from parent material weathering. Our results indicated that Cd posed a high risk to local ecosystem. The relatively lower pH and higher soil organic carbon SOC and total nitrogen TN in sediment may inhibit the fixation of heavy metals, which in turn increased the concentration of heavy metal in sediment.





Author: Cong Hu, Zheng-miao Deng, Yong-hong Xie, Xin-sheng Chen, and Feng Li

Source: https://www.hindawi.com/



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