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X-Ray Absorption Studies of Uranium Sorption on Mineral Substrates

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Abstract

Uranium L3-edge x-ray absorption spectra have been measured for uranium-mineral sorption systems. An expansible layer silicate, vermiculite, was treated to obtain a collapsed phase, thereby limiting access to the interior cation exchange sites. Samples were prepared by exposing the finely powdered mineral, in the natural and modified form, to aqueous solutions of uranyl chloride. EXAFS spectra of the encapsulated samples were measured at the Stanford Synchrotron Radiation Laboratory. Results indicate that the uranyl ion possesses a more symmetric local structure for the natural vermiculite than for the collapsed form, suggesting structural differences between uranyl species within the interlayer regions of vermiculite and on the external surfaces.

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Authors and Affiliations

  1. Lawrence Livermore National Laboratory, Livermore, CA, 94551, USA

    Eric A. Hudson, Louis J. Terminello & Brian E. Viani

  2. Forschungszentrum Rossendorf e. V., Institut ffir Radiochemie, Postfach 51 05 19, D-01314, Dresden, Germany

    Tobias Reich

  3. Lawrence Berkeley Laboratory, Berkeley, CA, 94720, USA

    Jerome J. Bucher, David K. Shuh & Norman M. Edelstein

Authors
  1. Eric A. Hudson
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  2. Louis J. Terminello
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  3. Brian E. Viani
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  4. Tobias Reich
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  5. Jerome J. Bucher
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  6. David K. Shuh
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  7. Norman M. Edelstein
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Hudson, E.A., Terminello, L.J., Viani, B.E. et al. X-Ray Absorption Studies of Uranium Sorption on Mineral Substrates. MRS Online Proceedings Library 375, 235–240 (1994). https://doi.org/10.1557/PROC-375-235

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  • DOI: https://doi.org/10.1557/PROC-375-235

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