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Determination of the Forward Dissolution Rate for International Simple Glass in Alkaline Solutions

Published online by Cambridge University Press:  05 January 2017

Alice Elia ,
Karine Ferrand  and
Karel Lemmens
Alice Elia*
Affiliation:
SCK•CEN, Belgian Nuclear Research Centre, Boeretang 200 - BE-2400 Mol, Belgium
Karine Ferrand
Affiliation:
SCK•CEN, Belgian Nuclear Research Centre, Boeretang 200 - BE-2400 Mol, Belgium
Karel Lemmens
Affiliation:
SCK•CEN, Belgian Nuclear Research Centre, Boeretang 200 - BE-2400 Mol, Belgium
*
*(Email: aelia@sckcen.be)

Abstract

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The International Simple Glass (ISG) is considered as reference benchmark glass and is used in the frame of an international collaboration for the study of the dissolution mechanisms of high-level vitrified nuclear waste.

In this work the forward dissolution rate of the ISG was determined in different alkaline solutions, as a simulation of the disposal conditions foreseen by the Belgian concept for geological disposal of vitrified waste. The determination of the forward dissolution rate was done by measuring the Si released from the glass in solution in tests performed at 30 °C in four different KOH solutions with pH varying from 9 to 14 and in artificial cementitious water at pH 13.5.

The forward dissolution rates determined for the ISG in high pH solutions are in good agreement with the results obtained for a lower pH range.

The rates obtained in this study, moreover, were compared with the rates measured in the same conditions for SON68 glass from a previous work. The values obtained for the two glasses are comparable in artificial cementitious water and in KOH at moderately alkaline pH. At higher pH, ISG glass shows a lower forward dissolution rate with respect to SON68 (0.20 g·m-2·d for ISG and 0.35 g·m-2 d for SON68 at pH 14).

Keywords

nuclear materialscorrosionwaste management
Type
Articles
Information
MRS Advances , Volume 2 , Issue 12: Scientific Basis for Nuclear Waste Management XL , 2017 , pp. 661 - 667
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
Copyright © Materials Research Society 2017

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