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The Relationship Between Reaction Layer Thickness and Leach Rate For Nuclear Waste Glasses

Published online by Cambridge University Press:  25 February 2011

L. A. Chick  and
L. R. Pederson
L. A. Chick
Affiliation:
Battelle Pacific Northwest Laboratory, P.O. Box 999, Richland, Washington 99352
L. R. Pederson
Affiliation:
Battelle Pacific Northwest Laboratory, P.O. Box 999, Richland, Washington 99352
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Abstract

Three leaching tests, devised to distinguish among several proposed nuclear waste glass leaching mechanisms, were carried out for four different waste glasses. In the first test, the influence of a pre-formed reaction layer on elemental release was evaluated. In the second test, glass specimens were replaced with fresh samples halfway through the leaching experiment, to evaluate the influence of the concentration of glass components in leaching. Finally, regular replacement of the leachant at fixed time intervals essentially removed the variable of changing solution concentration, and allowed an assessment of the influence of reaction layer thickness on the leaching rate. Results for all glasses tested indicated that the reaction layer presented little or no barrier to leaching, and that most of the retardation on leaching rates generally observed are attributable to saturation effects.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 26: Symposium D – Scientific Basis for Nuclear Waste Management VII , 1983 , 635
Copyright
Copyright © Materials Research Society 1984

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References

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