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Changes in u(VI) SPeciation Upon Sorption onto Montmorillonite from Aqueous and Organic Solutions

Published online by Cambridge University Press:  25 February 2011

Catherine Chisholm-Brause ,
Steven D. Conradson ,
P. Gary Eller  and
David E. Morris
Catherine Chisholm-Brause
Affiliation:
Isotope and Nuclear Chemistry Division Los Alamos National Laboratory Los Alamos, New Mexico 87545, USA
Steven D. Conradson
Affiliation:
Isotope and Nuclear Chemistry Division Los Alamos National Laboratory Los Alamos, New Mexico 87545, USA
P. Gary Eller
Affiliation:
Isotope and Nuclear Chemistry Division Los Alamos National Laboratory Los Alamos, New Mexico 87545, USA
David E. Morris*
Affiliation:
Isotope and Nuclear Chemistry Division Los Alamos National Laboratory Los Alamos, New Mexico 87545, USA
*
*author to whom correspondence should be addressed
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Abstract

The speciation of UO22+ and UO22+/ TBP mixtures has been investigated in solution and intercalated with the reference smectite clay SAz-1 using x-ray absorption, Raman, andluminescence spectroscopies. Neither aquated UO22+ nor its TBP complex undergoes any detectable changes in uranium oxidation state on intercalation. Further, at the pH values employed in this work, there is no evidence for hydrolysis of the uranium species to generate dimeric or higher order uranium oligomers. However, we do find indications that the structures of the solution complexes are altered on intercalation, particularly for the UO22+TBP system and for more dilute UO22+/aqueous systems. In addition, several lines of evidence suggest that, at the loading levels used in this study, the uranyl species is interacting with two or more spectroscopically distinguishable sites on SAz-1.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 257: Symposium – Scientific Basis for Nuclear Waste Management XV , 1991 , 315
Copyright
Copyright © Materials Research Society 1992

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