Microcosm studies on iron and arsenic mobilization from aquifer sediments under different conditions of microbial activity and carbon source |
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Authors: | Mengyu Duan Zuoming Xie Yanxin Wang Xianjun Xie |
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Institution: | (1) School of Environmental Studies and Key Laboratory of Biogeology and Environmental Geology of Ministry of Education, China University of Geosciences, 430074 Wuhan, People’s Republic of China |
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Abstract: | Microcosm experiments were conducted to understand the mechanism of microbially mediated mobilization of Fe and As from high
arsenic aquifer sediments. Arsenic-resistant strains isolated from aquifer sediments of a borehole specifically drilled for
this study at Datong basin were used as inoculated strains, and glucose and sodium acetate as carbon sources for the experiments.
In abiotic control experiments, the maximum concentrations of Fe and As were only 0.47 mg/L and 0.9 μg/L, respectively. By
contrast, the maximum contents of Fe and As in anaerobic microcosm experiments were much higher (up to 1.82 mg/L and 12.91
μg/L, respectively), indicating the crucial roles of microbial activities in Fe and As mobilization. The observed difference
in Fe and As release with different carbon sources may be related to the difference in growth pattern and composition of microbial
communities that develop in response to the type of carbon sources. |
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Keywords: | Arsenic Iron Carbon source Microcosm experiment Biogeochemistry |
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