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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.

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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