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X-Ray Absorption Studies of Uranium Sorption on Mineral Substrates

Published online by Cambridge University Press:  15 February 2011

Eric A. Hudson ,
Louis J. Terminello ,
Brian E. Viani ,
Tobias Reich ,
Jerome J. Bucher ,
David K. Shuh  and
Norman M. Edelstein
Eric A. Hudson
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94551
Louis J. Terminello
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94551
Brian E. Viani
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94551
Tobias Reich
Affiliation:
Forschungszentrum Rossendorf e. V., Institut ffir Radiochemie, Postfach 51 05 19, D-01314 Dresden, Germany
Jerome J. Bucher
Affiliation:
Lawrence Berkeley Laboratory, Berkeley, CA 94720
David K. Shuh
Affiliation:
Lawrence Berkeley Laboratory, Berkeley, CA 94720
Norman M. Edelstein
Affiliation:
Lawrence Berkeley Laboratory, Berkeley, CA 94720
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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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 375: Symposia AA – Applications of Synchrotron Radiation Techniques to Materials Science , 1994 , 235
Copyright
Copyright © Materials Research Society 1995

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