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Leach Behavior of SRL TDS-131 Defense Waste Glass in Water at High&Low Flow Rates

Published online by Cambridge University Press:  25 February 2011

Aaron Barkatt ,
William Sousanpour ,
Alisa Barkatt ,
Morad A. Boroomand  and
Pedro B. Macedo
Aaron Barkatt
Affiliation:
Vitreous State Laboratory, The Catholic University of America, Washington, D.C. 20064
William Sousanpour
Affiliation:
Vitreous State Laboratory, The Catholic University of America, Washington, D.C. 20064
Alisa Barkatt
Affiliation:
Vitreous State Laboratory, The Catholic University of America, Washington, D.C. 20064
Morad A. Boroomand
Affiliation:
Vitreous State Laboratory, The Catholic University of America, Washington, D.C. 20064
Pedro B. Macedo
Affiliation:
Vitreous State Laboratory, The Catholic University of America, Washington, D.C. 20064
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Abstract

Leach tests carried out on SRL TDS-131 Defense Waste Class indicate that at high flow rates the controlling mechanism is simple corrosion. The matrix elements (Si, Al) are leached out at rates similar to those of the leaching of the alkalis and of boron, and the leaching process is nearly linear with time. At slow flow rates (below 1 m/yr) leaching becomes controlled by the build-up of a protective layer. Al and most of the Si remain in the leached surface layer. The leach rates decrease in the course of the test before leveling off at constant values which are almost inversely proportional to the contact time, indicating that leachate concentrations have become solubility-limited. The low concentrations observed at this stage indicate the formation of alteration products.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 26: Symposium D – Scientific Basis for Nuclear Waste Management VII , 1983 , 643
Copyright
Copyright © Materials Research Society 1984

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References

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