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X-ray Absorption Fine Structure Studies of Speciation of Technetium in Borosilicate Glasses

Published online by Cambridge University Press:  01 February 2011

Wayne W. Lukens ,
David K. Shuh ,
Isabelle S. Muller  and
David A. McKeown
Wayne W. Lukens
Affiliation:
Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
David K. Shuh
Affiliation:
Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
Isabelle S. Muller
Affiliation:
Vitreous State Laboratory, The Catholic University of America, Washington, D.C. 20064, USA.
David A. McKeown
Affiliation:
Vitreous State Laboratory, The Catholic University of America, Washington, D.C. 20064, USA.
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Abstract

A series of glass samples were prepared analogously to high level waste glass using either glass frit or glass precursors combined with a high level waste surrogate containing NaTcO4. Three different technetium species were observed in these glasses depending upon the synthesis conditions. If the glasses were prepared by reducing NaTcO4 to TcO2•2H2O with hydrazine or if a large amount of organic material was present, inclusions of TcO2 were observed. If no organic material was present, technetium was incorporated as TcO4−. If only a small amount of organic material was present, isolated Tc(IV) sites were observed in the glass. The relative technetium retention of these glasses was estimated from the Tc K-edge height, and had no correlation with the oxidation state of the technetium. Pertechnetate was well retained in these glasses.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 802: Symposium DD – Actinides - Basic Science, Applications, and Technology , 2003 , DD3.3
Copyright
Copyright © Materials Research Society 2004

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References

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