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Mechanism of Heavy Element Retention in Hydrated Layers Formed on Leached Silicate Glasses

Published online by Cambridge University Press:  26 February 2011

J.-C. Petit ,
J.-C. Dran ,
L. Trotignon ,
J.-M. Casabonne ,
A. Paccagnella  and
G. Della Mea
J.-C. Petit
Affiliation:
SESD/LECALT, CEN-FAR, 92265 Fontenay-aux-roses, France
J.-C. Dran
Affiliation:
CSNSM/CNRS, 91405 Orsay, France
L. Trotignon
Affiliation:
SESD/LECALT, CEN-FAR, 92265 Fontenay-aux-roses, France
J.-M. Casabonne
Affiliation:
LRS, Université de Bourgogne, 21000 Dijon, France
A. Paccagnella
Affiliation:
Dipartimento di Ingegneria, Università di Trento, 38050 Mesiano, Italy
G. Della Mea
Affiliation:
Dipartimento di Ingegneria, Università di Trento, 38050 Mesiano, Italy Unità CISM-GNSM di Padova, 35131 Padova, Italy
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Abstract

We have investigated the relationship between hydrated layer formation during aqueous corrosion of silicates and retention of heavy elements (Fe, REE, actinides). Our approach is based on the comparison of the dissolution behaviour of silicate glasses, silicate minerals implanted with increasing doses of lead ions (1×E+12 to 1×E+15 ions/cm2), sorption experiments on silica surfaces and direct precipitation of hydrosilicates. The characterization of reacted surfaces was performed by combining Rutherford backscattering spectrometry (RBS) for profiling heavy elements with Resonant Nuclear Reaction Analysis (RNRA) for hydrogen profilimetry. The accumulation of these elements does not necessarily imply a selective dissolution and can be explained by the “precipitation” of hydroxides or hydrosilicates.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 127: Symposium BERLIN – Scientific Basis for Nuclear Waste Management XII , 1988 , 33
Copyright
Copyright © Materials Research Society 1989

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References

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