| Title: | Uranium isotope fractionation during adsorption, (co) precipitation, and biotic reduction |
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| Authors: | ID Dang, Duc Huy, School of the Environment and ‡ Water Quality Center, Trent University, 1600 West Bank Drive, Peterborough, Ontario, Canada K9L 0G2 (Author)
ID Novotnik, Breda, School of the Environment and ‡ Water Quality Center, Trent University, 1600 West Bank Drive, Peterborough, Ontario, Canada K9L 0G2 (Author)
ID Wang, Wei, School of the Environment and ‡ Water Quality Center, Trent University, 1600 West Bank Drive, Peterborough, Ontario, Canada K9L 0G2 (Author)
ID Georg, Bastian R., School of the Environment and ‡ Water Quality Center, Trent University, 1600 West Bank Drive, Peterborough, Ontario, Canada K9L 0G2 (Author)
ID Evans, Douglas R., School of the Environment and ‡ Water Quality Center, Trent University, 1600 West Bank Drive, Peterborough, Ontario, Canada K9L 0G2 (Author) |
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| Files: |
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| Language: | English |
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| Work type: | Not categorized |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | UNG - University of Nova Gorica
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| Abstract: | Uranium contamination of surface environments is a problem associated with both U-ore extraction/processing and situations in which groundwater comes into contact with geological formations high in uranium. Apart from the environmental concerns about U contamination, its accumulation and isotope composition have been used in marine sediments as a paleoproxy of the Earth’s oxygenation history. Understanding U isotope geochemistry is then essential either to develop sustainable remediation procedures as well as for use in paleotracer applications. We report on parameters controlling U immobilization and U isotope fractionation by adsorption onto Mn/Fe oxides, precipitation with phosphate, and biotic reduction. The light U isotope (235U) is preferentially adsorbed on Mn/Fe oxides in an oxic system. When adsorbed onto Mn/Fe oxides, dissolved organic carbon and carbonate are the most efficient ligands limiting U binding resulting in slight differences in U isotope composition (δ238U = 0.22 ± 0.06‰) compared to the DOC/DIC-free configuration (δ238U = 0.39 ± 0.04‰). Uranium precipitation with phosphate does not induce isotope fractionation. In contrast, during U biotic reduction, the heavy U isotope (238U) is accumulated in reduced species (δ238U up to −1‰). The different trends of U isotope fractionation in oxic and anoxic environments makes its isotope composition a useful tracer for both environmental and paleogeochemical applications. |
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| Keywords: | Uranium, fractionation, biotic, abiotic, oxides |
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| Publication version: | Version of Record |
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| Year of publishing: | 2016 |
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| Number of pages: | 12695-12704 |
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| Numbering: | 2016, 23 |
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| PID: | 20.500.12556/RUNG-4767-a5633efc-313a-2fc2-3662-dd2c8a7b7e46 |
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| COBISS.SI-ID: | 5458427 |
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| DOI: | 10.1021/acs.est.6b01459 |
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| NUK URN: | URN:SI:UNG:REP:RFKQHTTM |
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| Publication date in RUNG: | 04.10.2019 |
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| Views: | 2903 |
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| Downloads: | 0 |
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