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Stable isotopes (S, CI) and hydrochemical variations in a karstic ground water system, Guiyang, SW China
Yunchao LANG;  Congqiang;   Jianghong WE;  Hiroshi Satake;  Siliang LI
2006
发表期刊Chinese Journal of Geochemistry
卷号25页码:173-173
摘要

A groundwater system in a karstic terrain is easily subject to pollution and its remediation is difficult once contaminated by human activities. The groundwater samples collected in both winter and summer seasons at Gulyang, SW China, show a wide range of variations in chemical composition and dominance of Ca 2., Mg 2+, SO42-, and HCO3 ions. The anthropogenic inputs include CI, NO3, SO42-, Na +, and K +, as judged from the relationships between different elemental ratios and sewage samples. C1- concentrations of all water samples in the study area vary from 0 to 3.9 mmol/L in winter and are higher than in summer. In most of the samples, SO4 zconcentrations are high, ranging from 0.1 to 11 mmol/L. The studies show that the cycling of sulfur plays an important role in controlling water chemistry and fate of contaminants in groundwater. In order to understand the source of SO42- and the geochemical cycling of some elements in the karstic groundwater environment, we have carried out a study on the variations of S and C1 isotope compositions, in addition to other isotopic tracers such as 87Sr/86Sr and ~13C studied previously. The ~37C1 values of the groundwater samples present a seasonal variation, ranging from 0.00%0 to +2.03%0 in winter and from -1.46%o to +0.29%0 in summer. The surface water samples show a similar range of variations as observed for groundwater. Two rainwater samples collected at Gulyang have a distinct isotopic signature (mean value is --3%0) compared to the ~37C1 values reported in literature. These results indicate that ground water is mainly derived from precipitation and suggest a fast recharge of the karst system by surface water. The G34S values of SO42 in the groundwater range from -20%0 to +22%0, with most of the values between -15 9/00 and +10 9/00 and no seasonality is observed for the G 34S values. Correlations between G34S and C1/HCO3, Ca/SO4, G13C and 87Sr]86Sr are in favor of mixing between at least 3 sulfur sources into the karst system: dissolution of sulfate evaporites, oxydation of sulfide minerals present in coal-containing strata and anthropogenic inputs including atmospheric inputs and domestic discharge. The covariations between G34S, G13C, and 87Sr]86Sr indicate that sulfuric acid produced via oxidation of sulfide minerals and organic sulfur probably takes a significant part in the dissolution of carbonate rocks in this karstic region.

关键词Karst Groundwater Hydrochemistry Chlorine Isotope Sulfur Isotope
收录类别EI
语种英语
文献类型期刊论文
条目标识符http://ir.gyig.ac.cn/handle/42920512-1/9451
专题环境地球化学国家重点实验室
作者单位1.State Key Laboratory of Environmental Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China
2.Department of Environmental Biology and Chemistry, Toyama University, Toyama 930-8555, Japan
推荐引用方式
GB/T 7714
Yunchao LANG;Congqiang; Jianghong WE;Hiroshi Satake;Siliang LI. Stable isotopes (S, CI) and hydrochemical variations in a karstic ground water system, Guiyang, SW China[J]. Chinese Journal of Geochemistry,2006,25:173-173.
APA Yunchao LANG;Congqiang; Jianghong WE;Hiroshi Satake;Siliang LI.(2006).Stable isotopes (S, CI) and hydrochemical variations in a karstic ground water system, Guiyang, SW China.Chinese Journal of Geochemistry,25,173-173.
MLA Yunchao LANG;Congqiang; Jianghong WE;Hiroshi Satake;Siliang LI."Stable isotopes (S, CI) and hydrochemical variations in a karstic ground water system, Guiyang, SW China".Chinese Journal of Geochemistry 25(2006):173-173.
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