NDLI: Hydrogeochemistry and possible sulfate sources in karst groundwater in Chongqing, China

Content Provider	Springer Nature Link
Author	Pu, Junbing Yuan, Daoxian Zhang, Cheng Zhao, Heping
Copyright Year	2012
Abstract	Groundwater from karst subterranean streams is among the world’s most important sources of drinking water supplies, and the hydrochemical characteristics of karst water are affected by both natural environment and people. Therefore, the study of karst groundwater hydrochemistry and its solutes’ sources is very important to ensure the normal function of life support systems. This paper focused on the major ion chemistry and sulfate isotope of karst groundwater in Chongqing for tracing the sulfate sources and related hydrochemical processes. Hydrochemical types of karst groundwater in Chongqing were mainly of the Ca-HCO$_{3}$ type or Ca(Mg)-HCO$_{3}$ type. However, some hydrochemical types were the K + Na + Ca-SO$_{4}$ type (G25 site) or Ca-HCO$_{3}$ + SO$_{4}$ type (G26 and G14 sites), indicating that the hydrochemistry of these sites may be strongly influenced by anthropogenic activities or unique geological characteristics. The δ$^{34}$S-SO$_{4}$ $^{2−}$ of collected karst groundwater sample fell into a range of −6.8 to 21.5 ‰, with a mean value of 5.6 ‰. In dolomite aquifer, the δ$^{34}$S-SO$_{4}$ $^{2−}$ value ranges from −4.3 to 11.0 ‰, and in limestone aquifer, it ranged from −6.8 to 21.5 ‰. The groundwater samples from different land use types showed distinctive δ$^{34}$S-SO$_{4}$ $^{2−}$ value. The δ$^{34}$S-SO$_{4}$ $^{2−}$ value of groundwater samples had range of −6.8 to 16.7 ‰ (mean 4.0 ‰, n = 11) in cultivated land areas, 1.5–21.5 ‰ (mean 7.2 ‰, n = 20) in forested land areas, and −4.3 to 0.8 ‰ (mean −1.7 ‰, n = 2) in coalmine areas. The δ$^{34}$S-SO$_{4}$ $^{2−}$ values of groundwater samples collected from factory area and town area were 2.2 and 9.9 ‰, respectively. According to the δ$^{34}$S information of potential sulfate sources, this paper discussed the possible sulfate sources of collected karst groundwater samples in Chongqing. The variations of both δ$^{34}$S and 1/SO$_{4}$ $^{2−}$ values of the groundwater samples indicated that the atmospheric acid deposition (AAD), dissolution of gypsum (GD), oxidation of sulfide mineral (OS) or anthropogenic inputs (SF: sewage or fertilizer) contributed to sulfate in karst groundwater. The influence of oxidation of sulfide mineral, atmospheric acid deposit and anthropogenic inputs to groundwater in Chongqing karst areas was much widespread. For protecting, sustaining, and utilizing the groundwater resources, the sewage possibly originating from urban, mine or industrial area must be controlled and treated, and the use of fertilizer should be limited.
Starting Page	159
Ending Page	168
Page Count	10
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	68
Issue Number	1
e-ISSN	18666299
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-05-30
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sulfate isotope Hydrogeochemistry Karst groundwater Chongqing Municipality Geology
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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