期刊
NATURE COMMUNICATIONS
卷 8, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms15538
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资金
- University of Wyoming, School of Energy Resources
- Toxic Substance Hydrology Program at the US Geological Survey
- US Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-76SF00515]
Historically, it is believed that crystalline uraninite, produced via the abiotic reduction of hexavalent uranium (U-(VI)) is the dominant reduced U species formed in low-temperature uranium roll-front ore deposits. Here we show that non-crystalline U-(IV) generated through biologically mediated U-(VI) reduction is the predominant U-(IV) species in an undisturbed U roll-front ore deposit in Wyoming, USA. Characterization of U species revealed that the majority (similar to 58-89%) of U is bound as U-(IV) to C-containing organic functional groups or inorganic carbonate, while uraninite and U-(VI) represent only minor components. The uranium deposit exhibited mostly U-238-enriched isotope signatures, consistent with largely biotic reduction of U-(VI) to U-(IV). This finding implies that biogenic processes are more important to uranium ore genesis than previously understood. The predominance of a relatively labile form of U-(IV) also provides an opportunity for a more economical and environmentally benign mining process, as well as the design of more effective post-mining restoration strategies and human health-risk assessment.
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