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Volume 33 Issue 2
Jun.  2014
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Article Contents
REN Kun, YANG Ping-heng, DU Wei, SHI Yang, REN Xiao-feng, LI Xiao-chun. Heavy metal pollution and toxicity assessment of interstitial water from Laolongdong subterranean river, Chongqing[J]. CARSOLOGICA SINICA, 2014, 33(2): 231-237.
Citation: REN Kun, YANG Ping-heng, DU Wei, SHI Yang, REN Xiao-feng, LI Xiao-chun. Heavy metal pollution and toxicity assessment of interstitial water from Laolongdong subterranean river, Chongqing[J]. CARSOLOGICA SINICA, 2014, 33(2): 231-237.

Heavy metal pollution and toxicity assessment of interstitial water from Laolongdong subterranean river, Chongqing

  • Received Date: 2013-11-26
  • Publish Date: 2014-06-25
  • With increasing urbanization and industrialization, karst subterranean river systems, an important source of drinking water in karst areas, have suffered from various degrees of pollution. Samples of overlying water and interstitial water from surface sediments were collected at the seven sampling sites along the Laolongdong subterranean river in Chongqing karst area during September 2013. Mn concentrations were measured by ICP-OES, and Cu, Cd, Cr, As and Pb were measured by ICP-MS, in order to determine the heavy metal pollution status. The spatial distribution of the heavy metals in the interstitial water and the relationships between metals in different media were studied. Meanwhile, the biological toxicity of the metals in interstitial water was assessed according to the National Recommended Water Quality Criteria released by the EPA. The results showed that the overlying water of Laolongdong subterranean river is not suitable for drinking, as the Mn and Pb levels were higher than limits (Mn≤100 ug/L, Pb≤10 ug/L) established by GB 5749-2006. The concentrations of metals in the interstitial water samples were higher than those in the overlying water samples. This phenomenon probably indicates that the heavy metals may be released from the interstitial water into the overlying water. The concentrations of the studied metals (with the exception of Mn and Pb) in interstitial water decreased from upstream to midstream to downstream locations. Although statistical analysis suggested that there were no significant correlations between the concentrations of these metals occurring in overlying water, with the exception of Mn and As, as well as Cd and Cr, high correlations were found between Cu, Cd, Cr and As in interstitial water. Toxicity assessment of the interstitial water showed that Pb and especially Cr, Cu and Cd, pose acute toxicity to the aquatic ecosystem. However, As does not pose acute toxicity to the aquatic ecosystem.

     

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