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The Solubility of Unirradiated UO2 In Both Perchlorate And Chloride Test Solutions. Influence of the Ionic Medium

Published online by Cambridge University Press:  28 February 2011

M. E. Torrero ,
I. Casas ,
M. Aguilar ,
J. De Pablo ,
J. Gimenez  and
J. Bruno
M. E. Torrero
Affiliation:
UPC, Department of Chemical Engineering, 08028 Barcelona, Spain.
I. Casas
Affiliation:
UPC, Department of Chemical Engineering, 08028 Barcelona, Spain.
M. Aguilar
Affiliation:
UPC, Department of Chemical Engineering, 08028 Barcelona, Spain.
J. De Pablo
Affiliation:
UPC, Department of Chemical Engineering, 08028 Barcelona, Spain.
J. Gimenez
Affiliation:
UPC, Department of Chemical Engineering, 08028 Barcelona, Spain.
J. Bruno
Affiliation:
MBT, Tecnología Ambiental, 08290 Cerdanyola, Spain.
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Abstract

The solubility of a crystalline unirradiated UO2 (s) has been studied under reducing conditions at 25°C in three different ionic media: 0.008 mol dm–3 NaCIO4, 1 and 5 mol dm-3 NaCl+. The species responsible for the solubility in perchlorate medium are U(OH)3 and U(OH)4, with the stability constants log β13 = -0.4(±0.2) and log β14 = -5.7(±0.1), respectively. The solubility in both1! and 5 M chloride media is explained at pH values higher than 6 by the species U(OH)4 with log β14 = -5.5(±0.2) while at lower pH values an abnormal behaviour is observed, with higher uranium concentrations in solution and a proton independent solubility for pH values lower than 4. The XPS observations of the reacted solids do not show the presence of solid surface phases other than uranium dioxide, with an upper oxidation state of UO2.1.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 212: Symposium P – Scientific Basis for Nuclear Waste Management XIV , 1990 , 229
Copyright
Copyright © Materials Research Society 1991

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References

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