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The Solubility of Amorphous and Crystalline Schoepite in Neutral to Alkaline Aqueous Solutions

Published online by Cambridge University Press:  26 February 2011

Jordi Bruno  and
Amaia Sandino
Jordi Bruno
Affiliation:
Department of Inorganic Chemistry, Royal Institute of Technology S—100 44, Stockholm, Sweden.
Amaia Sandino
Affiliation:
Department of Inorganic Chemistry, Royal Institute of Technology S—100 44, Stockholm, Sweden.
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Abstract

The solubility of schoepite, UO2(OH)2 H2O, has been investigated by potentiometric titration at 25 °C in 0.5 mol dm.−3 NaClO4 solution. The data indicates the predominance of the species (UO2)3(OH)5+ and either UO2(OH)3− or (UO2)3(OH)7− in the pH range studied. The formation constants of these species as well as the solubility product of the amorphous and microcrystalline schoepite have been determined. The consequences of these data on the hypothesis of schoepite as the solubility limiting phase in spent fuel dissolution studies is discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 127: Symposium BERLIN – Scientific Basis for Nuclear Waste Management XII , 1988 , 871
Copyright
Copyright © Materials Research Society 1989

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References

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