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Huang Q.-B.,Wuhan University | Huang Q.-B.,Chinese Academy of Geological Sciences | Huang Q.-B.,Kay Laboratory of Karst Dynamics | Qin X.-Q.,Chinese Academy of Geological Sciences | And 8 more authors.
Huanjing Kexue/Environmental Science | Year: 2015

Groundwater and surface water from the Upper and Middle Reaches of the Wujiang River were sampled and analyzed for the hydrochemistry and Carbon isotope in DIC. Then hydrochemical characteristics and the main influencing factors were investigated, and the contributions of carbonate dissolution by sulphuric acid to total (Ca2++Mg2+) and HCO3- were calculated using the stoichiometry method. The results showed that the advantage cations of groundwater and surface water is Ca2+, which accounted for more than 50%, and the advantage anions is HCO3- and SO42-, which accounted for more than 85%. The hydrochemical characteristics of most samples were of Ca-HCO3 type, and a small part of HCO3·SO4-Ca, reflecting a few samples affected by SO42- from human source. The δ13CDIC of groundwater and surface water, varying from -12.98‰ to -6.36‰ with a changeable molar ratio between (Ca2++Mg2+) and HCO3- of 1.11 to 1.90, indicated that sulfuric acid has an important influence on hydrochemistry and δ13CDIC. The contributions of carbonate dissolution by sulphuric acid to total (Ca2++Mg2+) and HCO3- in groundwater ranged from 20.59% to 92.87% (average 51.50%), and from 11.47% to 86.69% (average 36.90%). While the contributions of carbonate dissolution by sulphuric acid to total (Ca2++Mg2+) and HCO3- in surface water ranged from 56.14% to 94.55% (with an average of 76.89%), and 39.02% to 89.66% (with an average of 64.24%), respectively, demonstrated that sulphuric acid is an important agent of carbon rock weathering. The results of this study have a great significance for the protection and development and utilization of water resources in the Wujiang River basin and for karst carbon cycle research. ©, 2015, Science Press. All right reserved. Source

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