Analysis and assessment of heavy metal contamination in surface water and sediments: a case study from Luan River, Northern China

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• 作者：Zhaoming Wang (1) (2)
  Ranhao Sun (1)
  Haiping Zhang (1) (2)
  Liding Chen (1)
  
  1. State Key Laboratory of Urban and Regional Ecology ; Research Center for Eco-Environmental Sciences ; Chinese Academy of Sciences ; Beijing ; 100085 ; China
  2. University of Chinese Academy of Sciences ; Beijing ; 100049 ; China
  
• 关键词：heavy metal ; water ; sediment ; geo ; accumulation index ; Luan River
• 刊名：Frontiers of Environmental Science & Engineering
• 出版年：2015
• 出版时间：April 2015
• 年：2015
• 卷：9
• 期：2
• 页码：240-249
• 全文大小：604 KB
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• 刊物主题：Environment, general;
• 出版者：Springer Berlin Heidelberg
• ISSN：2095-221X

文摘

Concentrations of the heavy metals Cu, Ni, Pb, Zn, Cd, and Cr were examined in surface water and sediment from the Luan River inChina,. With a decline in Cu and Ni concentration found in surface water at downstream stations. This finding suggests that water currents are a major explanatory factor in heavy metal contamination. The abundance of Cr, Pb, and Cd observed in the middle reaches of the river indicates heavy metal contamination in local areas, although there was an obvious decrease in concentrations in the water downstream of the Daheiting Reservoir. The significant rising trend in Cu, Pb, and Ni seen the sediment farther away from the river also suggests that anthropogenic activities contribute to heavy metal pollution Sediments were therefore used as environmental indicators, with sediment assessment was conducted using the geo-accumulation index (I geo) and the potential ecological risk index (RI). The I geo values revealed that Cd (3.13) and Cr (2.39) had accumulated significantly in the Luan River. The RI values for most (89%) of the sampling stations were higher than 300, suggesting that sediment from the Luan River poses a severe ecological risk, with the potential ecological risks downstream higher than that in the upper and middle streams. Good correlations among Pb/Ni, Pb/Cd, Cu/Pb, and Cu/Cd in the water and Cr/Ni in the sediment were observed. Cluster analysis suggested that Cd may have various origins, being derived from anthropogenic sources.