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U2O5 Film Preparation via UO2 Deposition by Direct Current Sputtering and Successive Oxidation and Reduction with Atomic Oxygen and Atomic Hydrogen
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Uranium transformations in static microcosms.

Shelly D Kelly1, Wei-Min Wu, Fan Yang

  • 1Biosciences Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439-4843, USA. skelly@anl.gov

Environmental Science & Technology
|December 5, 2009
PubMed
Summary
This summary is machine-generated.

Understanding uranium (U) speciation in subsurface environments is key for effective remediation. This study reveals U(VI) transforms to stable U(IV) via microbial processes, forming uraninite and binding to iron ligands.

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Area of Science:

  • Environmental Science
  • Geochemistry
  • Microbiology

Background:

  • Subsurface uranium speciation impacts remediation strategies.
  • Biogeochemical processes are crucial for understanding uranium stability.
  • Microcosm studies simulate in situ bioreduction conditions.

Purpose of the Study:

  • To investigate uranium (U) speciation and transformation in subsurface microcosms.
  • To identify the biogeochemical processes and microbial communities involved in U reduction.
  • To understand the stability of U species under varying redox conditions.

Main Methods:

  • Static microcosms simulating subsurface conditions.
  • Uranium L(3)-edge X-ray absorption near-edge structure (XANES) spectroscopy for speciation.
  • Extended X-ray absorption fine structure (EXAFS) for structural analysis.
  • Microbial community analysis to identify key functional groups.

Main Results:

  • Uranium(VI) transformed into Uranium(IV) through at least two distinct processes.
  • Uranium(IV) formed as uraninite and U bound to iron-rich ligands.
  • Fe(III) and sulfate-reducing bacteria were identified at different depths.
  • Slow U(VI) to U(IV) reduction contributed to U(IV) stability.

Conclusions:

  • Microbial reduction is a key process for U(VI) to U(IV) transformation in subsurface environments.
  • The formation of uraninite and association with Fe-ligands enhance uranium stability.
  • Limited electron donors can lead to long-term stability of reduced uranium species.