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Volume 33 Issue 1
Mar.  2014
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Article Navigation >  CARSOLOGICA SINICA  > 2014  >  33(1): 15-21
REN Kun, SHI Yang, LI Xiao-chun, LAN Jia-cheng, XU Shang-quan. Study of the chemical features and geochemical susceptibility of the groundwater system in a typical karst trough valley[J]. CARSOLOGICA SINICA, 2014, 33(1): 15-21. doi: 10.3969/j.issn.1001-4810.2014.01.003
Citation: REN Kun, SHI Yang, LI Xiao-chun, LAN Jia-cheng, XU Shang-quan. Study of the chemical features and geochemical susceptibility of the groundwater system in a typical karst trough valley[J]. CARSOLOGICA SINICA, 2014, 33(1): 15-21. doi: 10.3969/j.issn.1001-4810.2014.01.003
shu

Study of the chemical features and geochemical susceptibility of the groundwater system in a typical karst trough valley

doi: 10.3969/j.issn.1001-4810.2014.01.003
  • 1.

    School of Geographical Sciences, Southwest University / Key Laboratory of Eco-environments in Three Gorges Reservoir, Ministry of Education；Field of Scientific Observation & Research Base of Karst Eco-environments at NanChuan in Chongqing,MLR；Key Laboratory of Karst Dynamics, MLR&GZAR

  • 2.

    School of Geographical Sciences, Southwest University / Key Laboratory of Eco-environments in Three Gorges Reservoir, Ministry of Education；Field of Scientific Observation & Research Base of Karst Eco-environments at NanChuan in Chongqing,MLR

  • 3.

    College of Resources and Environment, Northwest University, Xi’an

  • Received Date: 2013-10-28
  • Publish Date: 2014-03-25
    Abstract
  • The karst groundwater system is an important drinking water sources in karst regions. However, with urbanization development, groundwater in China has been widely polluted, especially karst groundwater in southwestern China. It is important to study the degree of response and mechanisms of groundwater features by external interference in order to guarantee drinking water safety. Using hydrochemical data for April 2012 to March 2013, the geochemical susceptibility of groundwater in Laolongdong subterranean river and Zhaojiayuanzi epi-karst spring in the river watershed of Nanshan, Chongqing was analyzed, and the principal cations were Ca2+ and Mg2+in the epi-karst spring, and Ca2+ and Na+ in the subterranean river. The principal anions were HCO3- and SO42- in both the subterranean river and the epi-karst spring. The values of Mg2+ / Ca2+and Na+ / Ca2+were greater in the dry season than in rainy season. The value of HCO3- / SO42- was 5.693-8.664 and 3.428-6.524 in dry season, 3.428-6.524 and 3.122-5.966 in rainy season. This indicates a high concentration of HCO3- and low concentration of SO42-. Owing to agricultural activities, the rank order of geochemical susceptivity for major elements in the epi-karst spring is HCO3-> SO42-> Ca2+> NO3- > Mg2+ > Na+ > K+ > Cl-. When agricultural activities, industrial activities as well as urban construction activities were all taken into account, the rank order of geochemical susceptivity for major elements in the subterranean river became HCO3- > Na+ > Ca2+ > K+ > Cl- > Mg2+ > NO3- > SO42-. With anthropic activities, each ion is becoming increasingly susceptive. Thus, more attention should be paid to karst groundwater pollution.

     

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