Geochemistry of surface and ground water in Guiyang,China: Water/rock interaction and pollution in a karst hydrological system |
| |
| Institution: | 1. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing 100083, PR China;2. MOE Key Laboratory of Groundwater Circulation & Environment Evolution and School of Water Resources and Environment, China University of Geosciences, Beijing 100083, PR China;3. China Geological Survey, 24 Huangsi Dajie, Xicheng District, Beijing 100037, PR China;1. School of Environmental Studies, China University of Geosciences, Wuhan 430074, China;2. Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;3. College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China;1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, China;2. Department of Geology, University of Kansas, Lawrence, USA;3. Crawford Hydrology Laboratory, Western Kentucky University, Bowling Green, USA;4. Department of Geological Sciences, University of Florida, Gainesville, USA;5. Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin, China;6. School of Geographical Sciences, Southwest University, Chongqing, China;7. Institute of Geological Sciences, Freie Universität Berlin, Berlin, Germany |
| |
| Abstract: | The chemical compositions of the surface/ground water of Guiyang, the capital city of Guizhou Province, China are dominated by Ca2+, Mg2+, , which have been derived largely from chemical weathering of carbonate rocks (limestone and dolomite). The production of has multiple origins, mainly from dissolution of sulfate evaporites, oxidation of sulfide minerals and organic S in the strata, and anthropogenic sources. Most ground water is exposed to soil CO2 and, therefore, the H2CO3 which attacks minerals contains much soil C. In addition, the H2SO4 produced as a result of the oxidation of sulfides in S-rich coal seams and/or organic S, is believed to be associated with the chemical weathering of rocks. The major anthropogenic components in the surface and ground water include K+, Na+, Cl?, , with Cl? and being the main contributors to ground water pollution in Guiyang and its adjacent areas. The seasonal variations in concentrations of anthropogenic components demonstrate that the karst ground water system is liable to pollution by human activities. The higher content of in ground water compared to surface water during the summer and winter seasons, indicates that the karstic ground water system is not capable of denitrification and therefore does not easily recover once contaminated with nitrates. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
