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Volume 32 Issue 4
Dec.  2013
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Article Navigation >  CARSOLOGICA SINICA  > 2013  >  32(4): 377-383
ZHANG Liankai,, YANG Hui. Transport process of arsenic in karst subterranean stream and analysis on the influence factors: A case in Lihu subterranean stream of Nandan county, Guangxi[J]. CARSOLOGICA SINICA, 2013, 32(4): 377-383.
Citation: ZHANG Liankai,, YANG Hui. Transport process of arsenic in karst subterranean stream and analysis on the influence factors: A case in Lihu subterranean stream of Nandan county, Guangxi[J]. CARSOLOGICA SINICA, 2013, 32(4): 377-383.
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Transport process of arsenic in karst subterranean stream and analysis on the influence factors: A case in Lihu subterranean stream of Nandan county, Guangxi

  • Institute of Karst Geology, Chinese Academy of Geological Sciences / Karst Dynamics Laboratory, MLR & GZAR

  • Received Date: 2013-09-15
  • Publish Date: 2013-12-25
    Abstract
  • The arsenic pollutants generated by the arsenic industries and mining enterprises in karst area flow into subterranean streams and contaminate groundwater easily because of the unique hydrogeological characteristics of karst area, which is a serious threat to the water ecologic security and local residents’ health. In order to elucidate the geochemistry reaction mechanisms of arsenic in karst subterranean streams, the Lihu subterranean stream in Nandan county, Guangxi Province, Southwest China, is selected for the study. The main outcropped lithology in the Lihu subterranean stream catchment is Carboniferous Triassic limestone and the karstification rate is 31.67%. Arsenic species, sediment physical chemical properties and hydro-chemical characteristics of the water are analyzed by inductively coupled plasma mass spectrometer (ICP-MS), X-ray fluorescence spectrometer (XRF) and plasma spectrometer (ICP) respectively. The results show that arsenic concentration in the Lihu subterranean stream is high and it is closely related to human activities. The content of As (III), higher than As (V), occupies 53 % of the total inorganic arsenic in the Lihu subterranean stream due to the low redox environment, which increase the arsenic ecological risk in this region. The contents of total arsenic and As (III) as well as As (V) are attenuated by 51 %, 36 %, 59 % respectively in the underground river. Correlation coefficient analysis calculated with SPSS indicates that sediment Fe, sediment Ca, sediment organic matter, sediment Mn and water Ca2+ are the positive factors that promoting the deposition of arsenic from water. While water Cl-, SO42- and HCO3-, negatively correlated with arsenic in the water, do not facilitate to absorb arsenic. Compared with other water bodies, such as Quaternary groundwater, surface rivers and lakes waters, Ca and HCO3-, turn out to be the important factors for mobilization and transformation of arsenic due to the high calcium and bicarbonate content in karst water. Therefore, karst hydrogeological characteristics should be considered during arsenic contamination treatment in karst groundwater.

     

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