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Influence of Groundwater Composition on Glass Leaching and Actinide Speciation

Published online by Cambridge University Press:  28 February 2011

G. Bidoglio ,
P. Offermann ,
A. De Plano  and
G. P. Lazzari
G. Bidoglio
Affiliation:
Commission of the European Communities, Joint Research Centre, Radiochemistry Division, 21020 Ispra (Va) - Italy
P. Offermann
Affiliation:
Hahn-Meitner Institut für Kernforschung, 1000 Berlin, FRG
A. De Plano
Affiliation:
Commission of the European Communities, Joint Research Centre, Radiochemistry Division, 21020 Ispra (Va) - Italy
G. P. Lazzari
Affiliation:
Commission of the European Communities, Joint Research Centre, Radiochemistry Division, 21020 Ispra (Va) - Italy
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Abstract

Flow-leaching studies were conducted using borosilicate glass beads containing 241-Am, 237-Np and 238-Pu. The leachates were a bicarbonate groundwater and a brine. Tests were carried out unger oxidizing and reducing conditions. In bicarbonate groundwater (2.6 × 10−3 M NaHCO3, pH 8.4) under oxic conditions, steady-state leach-rates were found to increase in the order Pu∼Am<Np, with Np species leached congruently with sodium. Direct identification of Np carbonate complexes in the leachate was carried out by. electromigration. A reversed order of leachability was obtained in a reducing environment. In this case, Pu was found to be associated with particulate matter. In a salt brine leachate (5.4 M NaCl, pH∼6) a periodic cycle of increasing-decreasing concentrations was observed under reducing conditions. This was found to be dependent upon the redox state of actinides. Radionuclide adsorption into an unstable gel layer was postulated.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 112: Symposium P – Scientific Basis for Nuclear Waste Management XI , 1987 , 621
Copyright
Copyright © Materials Research Society 1988

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