Composition,stability, and measurement of reduced uranium phases for groundwater bioremediation at Old Rifle,CO |
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| Authors: | KM Campbell JA Davis J Bargar D Giammar R Bernier-Latmani R Kukkadapu KH Williams H Veramani K-U Ulrich J Stubbs S Yabusaki L Figueroa E Lesher MJ Wilkins A Peacock PE Long |
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| Institution: | 1. U.S. Geological Survey, 345 Middlefield Road, Menlo Park, CA 94025, USA;2. U.S. Geological Survey, 3215 Marine St., Boulder, CO 80303, USA;3. Lawrence Berkeley National Laboratory, 1 Cyclotron Rd., MS 90-1116, Berkeley, CA 94720, USA;4. Stanford Synchrotron Radiation Lightsource, 2575 Sand Hill Road, Menlo Park, CA 94025, USA;5. Washington University in Saint Louis, One Brookings Drive, St. Louis, MO 63130, USA;6. Environmental Microbiology Laboratory, École Polytechnique Fédérale de Lausanne, Lausanne, CH 1015, Switzerland;7. Pacific Northwest National Laboratory, Richland, WA 99352, USA;8. BGD Boden- und Grundwasserlabor GmbH Dresden, Tiergartenstraße 48, 01219 Dresden, Germany;9. Colorado School of Mines, 1500 Illinois St., Golden, CO 80401, USA;10. Haley and Aldrich, Oak Ridge, TN 37830, USA |
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| Abstract: | Reductive biostimulation is currently being explored as a possible remediation strategy for U-contaminated groundwater, and is being investigated at a field site in Rifle, CO, USA. The long-term stability of the resulting U(IV) phases is a key component of the overall performance of the remediation approach and depends upon a variety of factors, including rate and mechanism of reduction, mineral associations in the subsurface, and propensity for oxidation. To address these factors, several approaches were used to evaluate the redox sensitivity of U: (1) measurement of the rate of oxidative dissolution of biogenic uraninite (UO2(s)) deployed in groundwater at Rifle, (2) characterization of a zone of natural bioreduction exhibiting relevant reduced mineral phases, and (3) laboratory studies of the oxidative capacity of Fe(III) and reductive capacity of Fe(II) with regard to U(IV) and U(VI), respectively. |
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