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Determination of Early Stages of Glass Dissolution by pH Titration

Published online by Cambridge University Press:  26 February 2011

Judith A Garland  and
William B. White
Judith A Garland
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802
William B. White
Affiliation:
Materials Research Laboratory, The Pennsylvania State University, University Park, PA 16802
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Abstract

The early stages of glass dissolution are marked by rapid changes in pH for leach solutions with low buffer capacity. Consideration of both dissolution reactions and the electrical neutrality requirement allow the calculation of exchanged cation equivalents from the depletion of the H+-ion reservoir. Comparison was made between sodium trisilicate glass, a commercial waste glass (PNL 76−68), and the defense waste reference glass. The released Na+ calculated from the pH curve of sodium trisilicate glass has the expected parabolic dependence on time. Thenuclear waste glasses react with H+ more slowly and the pH - time plots do not have the shape of a titration curve. The equivalents of cations released follow a power law function, the exponent of which depends on initial pH. There are two distinct rate regimes for all glasses with initial fast rates related to consumption of H+ and later, slower rates nearly independent of H+ activity.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 44: Symposium N – Scientific Basis for Nuclear Waste Management VIII , 1984 , 81
Copyright
Copyright © Materials Research Society 1985

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References

1. Rana, M. A. and Douglas, R. W., Phys. Chem. Glasses 2, 179 (1961).Google Scholar
2. Rana, M. A. and Douglas, R. W., Phys. Chem. Glasses 2, 196 (1961).Google Scholar
3. Das, C. R. and Douglas, R. W., Phys. Chem. Glasses 8, 178 (1967).Google Scholar
4. El-Shamy, T. M. and Douglas, R. W., Glass Tech. 13, 77 (1972).Google Scholar
5. El-Shamy, T. M. and Douglas, R. W., Glass Tech. 13, 81 (1972).Google Scholar
6. Brawer, S. A., Thompson, G., and White, W. B., Final Rpt. to Atlantic Richfield Hanford Company, July, 1975.Google Scholar
7. Stumm, W. and Morgan, J. J., Aquatic Chemistry, John Wiley, New York, 2nd ed., (1981).Google Scholar
8. McElroy, J. L., Battelle Pacific Northwest Lab. Rpt. PNL-2264 (1977).Google Scholar
9. Mendel, J. E., Battelle Pacific Northwest Lab. Rpt. 5157 (1984).Google Scholar