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Leach Rate Excursions in Borosilicate Glasses: Effects of Glass and Leachant Composition

Published online by Cambridge University Press:  28 February 2011

Aa. Barkatt ,
S. A. Olszowka ,
W. Sousanpour ,
M. A. Adel-Hadadi ,
R. Adiga ,
Al. Barkatt ,
G. S. Marbury  and
S. Li
Aa. Barkatt
Affiliation:
The Catholic University of America, Washington, D.C. 20064
S. A. Olszowka
Affiliation:
The Catholic University of America, Washington, D.C. 20064
W. Sousanpour
Affiliation:
The Catholic University of America, Washington, D.C. 20064
M. A. Adel-Hadadi
Affiliation:
The Catholic University of America, Washington, D.C. 20064
R. Adiga
Affiliation:
The Catholic University of America, Washington, D.C. 20064
Al. Barkatt
Affiliation:
The Catholic University of America, Washington, D.C. 20064
G. S. Marbury
Affiliation:
The Catholic University of America, Washington, D.C. 20064
S. Li
Affiliation:
The Catholic University of America, Washington, D.C. 20064
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Abstract

Leach tests on borosilicate glasses using a partial-replenishment technique show that in certain cases large excursions in leach rate may appear at the end of periods ranging between 1 and 20 months. The extent and time of these leach rate transients are very sensitive to glass and leachant composition and to S/V ratio, and they may be eliminated by slight increases in Si and Al levels in the glass or by using a neutrally buffered leachant. This phenomenon, which may reflect cracking of the initial surface layer, can have a considerable effect on the results and complicate the modeling of leach tests which strongly reflect the extent of leaching during the early stages of glass/leachant interaction. However, these effects appear to have relatively little significance in the long term.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 212: Symposium P – Scientific Basis for Nuclear Waste Management XIV , 1990 , 65
Copyright
Copyright © Materials Research Society 1991

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References

REFERENCES

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