Model for the formation of arsenic contamination in groundwater. 1. Datong Basin,China |
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| Authors: | Yanxin Wang Teng Ma B. N. Ryzhenko O. A. Limantseva E. V. Cherkasova |
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| Affiliation: | (1) School of Environment Studies, China University of Geosciences, Lumo Road 388, Wuhan, China;(2) Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, ul. Kosygina 19, Moscow, 119991, Russia |
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| Abstract: | Mineral equilibria were analyzed in the system As-bearing rock-meteoric water. It was shown that carbonate rocks are the most probable source of As and Sr in the waters of the Datong Basin (People's Republic of China). The reason for groundwater enrichment in As is the shift of the equilibrium FeCO3 (siderite) + H2O = FeOOH(goethite) + CO2(g) + H2(g) to the left (toward siderite formation) owing to organic matter oxidation by atmospheric oxygen and an increase in the equilibrium partial pressure of CO2, while the Eh of the system remains below ?0.30 ± 0.06 V. |
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