Changes in U(VI) speciation upon sorption onto montmorillonite from aqueous and organic solutions

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The speciation of UO{sub 2}{sup 2+} and UO{sub 2}{sup 2+} Tributylphosphate (TBP) mixtures has been investigated in solution and intercalated with the reference smectite clay SAz-1 using x-ray absorption, Raman, and luminescence spectroscopies. Neither aquated UO{sub 2}{sup 2+} 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 UO{sub 2}{sup ... continued below

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Chisholm-Brause, C.; Morris, D.E.; Eller, P.G.; Buscher, T. & Conradson, S.D. January 1, 1991.

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The speciation of UO{sub 2}{sup 2+} and UO{sub 2}{sup 2+} Tributylphosphate (TBP) mixtures has been investigated in solution and intercalated with the reference smectite clay SAz-1 using x-ray absorption, Raman, and luminescence spectroscopies. Neither aquated UO{sub 2}{sup 2+} 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 UO{sub 2}{sup 2+}/TBP system. In addition, several lines of evidence suggest that, at the loading levels used in this study, the uranyl species may be interacting with two or more spectroscopically distinguishable sites on SAz-1. 29 refs., 3 figs., 2 tabs.

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Pages: (19 p)

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OSTI; NTIS; INIS; GPO Dep.

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  • 15. international symposium on the scientific basis for nuclear waste management, Strasbourg (France), 5-8 Nov 1991

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  • Other: DE92002420
  • Report No.: LA-UR-91-3175
  • Report No.: CONF-911123--1
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 5119404
  • Archival Resource Key: ark:/67531/metadc1056633

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  • January 1, 1991

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  • Jan. 22, 2018, 7:23 a.m.

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  • Feb. 1, 2018, 7:01 p.m.

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Chisholm-Brause, C.; Morris, D.E.; Eller, P.G.; Buscher, T. & Conradson, S.D. Changes in U(VI) speciation upon sorption onto montmorillonite from aqueous and organic solutions, article, January 1, 1991; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1056633/: accessed November 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.