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Studies on the Radionuclide Coprecipitation-Solid Solution Formation. The UO2(S)-La(OH)3(S) Coprecipitation as an Analogue for The UO2(S)-Pu(OH)3(S) System

Published online by Cambridge University Press:  28 February 2011

Jordi Bruno ,
Ingmar Grenthe  and
Maria Muñoz
Jordi Bruno
Affiliation:
Dept. of Inorganic Chemistry, Royal Institute of Technology, Stockholm, Sweden.
Ingmar Grenthe
Affiliation:
Dept. of Inorganic Chemistry, Royal Institute of Technology, Stockholm, Sweden.
Maria Muñoz
Affiliation:
Dept. of Inorganic Chemistry, Royal Institute of Technology, Stockholm, Sweden.
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Abstract

The UO2(s)-La(OH)3(s) coprecipitation equilibria have been studied in 0.5 M NaClO4 medium, at 25°C under anoxic conditions. The data obtained in the pH range between 2 and 5, and at different initial La(III)/U(IV) ratios (10%,5%,3%,2% and 1%), is explained by applying the Doerner-Hoskins logarithmic law. The same law can also be used to describe previously collected UO2(s)-Pu(OH)3(s) coprecipitation data. A method is proposed which uses the logarithmic distribution constants and the thermodynamic quantities for the pure phases to describe the solubility of radionuclides under repository conditions.

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Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 50: Symposium STOCKHOLM – Scientific Basis for Nuclear Waste Management IX , 1985 , 717
Copyright
Copyright © Materials Research Society 1985

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References

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