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Transport and Reaction Kinetics at the Glass:Solution Interface Region: Results of Repository-Oriented Leaching Experiments

Published online by Cambridge University Press:  28 February 2011

Teofilo A. Abrajano Jr.  and
John K. Bates
Teofilo A. Abrajano Jr.
Affiliation:
Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439
John K. Bates
Affiliation:
Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439
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Abstract

Repository-oriented leaching experiments involving Savannah River Laboratory (SRL) 165 type glass under a γ-radiation field (1= 0.2 × 104 R/h) have been performed by the Nevada Nuclear Waste Storage Investigations (NNWSI) project. In this communication, we discuss glass surface analyses obtained by SEM, nuclear resonance profiling, and SIMS together with leachate solution data in relation to a mechanism that couples diffusion, hydrolysis (etching and gelation), and precipitation to qualitatively describe the release of different glass components to the leachant solutions. The release of mobile (e.g., Li) and partly mobile (e.g., B) species is controlled primarily by interdiffusion with water species across the interdiffusion zone. Glass components that are immobile in the interdiffusion zone are released to the solution by etching. For prediction of long-term steady-state concentrations of glass components with low solubility, the relative rates of release from the glass and secondary mineral precipitation must be taken into account.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 84: Symposium L – Scientific Basis for Nuclear Waste Management X , 1986 , 533
Copyright
Copyright © Materials Research Society 1987

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