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A Comparative Study of Europium, Thorium and Uranium Binding to an Aquatic Fulvic Acid

Published online by Cambridge University Press:  01 January 1992

M. NordÉn ,
Y. Albinsson ,
J.H. Ephraim  and
B. Allard
M. NordÉn
Affiliation:
Department of Water and Environmental Studies, Linköping University, S-581 83, Linköping, Sweden
Y. Albinsson
Affiliation:
Department of Nuclear Chemistry, Chalmers University of Technology, S-412 96, Göteborg, Sweden
J.H. Ephraim
Affiliation:
Department of Water and Environmental Studies, Linköping University, S-581 83, Linköping, Sweden
B. Allard
Affiliation:
Department of Water and Environmental Studies, Linköping University, S-581 83, Linköping, Sweden
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Abstract

Advances in safe management and disposal of radioactive waste have shown that a comprehensive program requires the incorporation of dissolved organics into radwaste and transport effluent models, with respect to their binding of radionuclides. The binding of Eu3+, Th4+ and UO22+ to a well-characterized aquatic fulvic acid has been studied using an ultrafiltration method at a bulk electrolyte concentration of 0.10 M NaClO4, trace amounts of radionuclides and fulvic acid concentrations of 60 and 120 mg/l. The results expressed as the overall complex formation function, βov, versus pH show the following order: Th4+ > Eu3+ > UO22+. The estimated βov, values have been discussed by considering the aqueous chemistry of Eu3+, Th4+ and UO22+ vis-à-vis the solution chemistry of the fulvic acid sample.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 294: Symposium V – Scientific Basis for Nuclear Waste Management XVI , 1992 , 759
Copyright
Copyright © Materials Research Society 1993

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