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Determination of Formation Constants, Solubilities, and Ionic Speciation of Uranium, Plutonium and Thorium in Aqueous and Saturated Salt Solutions for Modelling Safety Aspects of Ilw Repositories

Published online by Cambridge University Press:  25 February 2011

H. Bischoff ,
U. Kramer-Schnabel ,
V. Esser ,
R.H. Xi ,
P.-M. Heppner  and
G. Marx
H. Bischoff
Affiliation:
FG Radiochemie, Freie Universität Berlin, Institut für Anorganische und Analytische Chemie, Fabeckstr. 34-36, 1000 Berlin 33, Germany
U. Kramer-Schnabel
Affiliation:
FG Radiochemie, Freie Universität Berlin, Institut für Anorganische und Analytische Chemie, Fabeckstr. 34-36, 1000 Berlin 33, Germany
V. Esser
Affiliation:
FG Radiochemie, Freie Universität Berlin, Institut für Anorganische und Analytische Chemie, Fabeckstr. 34-36, 1000 Berlin 33, Germany
R.H. Xi
Affiliation:
FG Radiochemie, Freie Universität Berlin, Institut für Anorganische und Analytische Chemie, Fabeckstr. 34-36, 1000 Berlin 33, Germany
P.-M. Heppner
Affiliation:
FG Radiochemie, Freie Universität Berlin, Institut für Anorganische und Analytische Chemie, Fabeckstr. 34-36, 1000 Berlin 33, Germany
G. Marx
Affiliation:
FG Radiochemie, Freie Universität Berlin, Institut für Anorganische und Analytische Chemie, Fabeckstr. 34-36, 1000 Berlin 33, Germany
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Abstract

The solubility products of uranyl hydroxide and uranyl carbonate and the formation constants of the complexes present in the solution have been determined at 25ºC and I=0.1 mol dm−3 by potentiometry and solubility experiments. The uranyl complexes U02(OH)2' (UO2)2(OH)22+,(UO2)3(OH)5+, UO2CO3', UO2(CO3)22− and UO2(CO3)34− were identified. For the system uranyl-hydroxide the results were verified by analysis of conductance measurements. A similar investigation was carriedout for thorium. Using Pu(IV)-chloride complexes as an example the potential of differential pulse voltarnmetry is demonstrated for the determination of small formation constants.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 257: Symposium – Scientific Basis for Nuclear Waste Management XV , 1991 , 331
Copyright
Copyright © Materials Research Society 1992

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References

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