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Studies on Speciation of Americium, Technetium and Neptunium in Simulated Vitrified-Waste Leachates

Published online by Cambridge University Press:  21 February 2011

G. Bidoglio ,
A. De Plano  and
A. Chatt
G. Bidoglio
Affiliation:
Commission of the European Communities, Joint Research Centre, Ispra Establishment, Radiochemistry and Nuclear Chemistry Division, I-21020 Ispra (Varese), ITALY
A. De Plano
Affiliation:
Commission of the European Communities, Joint Research Centre, Ispra Establishment, Radiochemistry and Nuclear Chemistry Division, I-21020 Ispra (Varese), ITALY
A. Chatt
Affiliation:
Visiting scientist, on sabbatical leave from Trace Analysis Research Centre, Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, B3H 4J1, Canada.
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Abstract

Physico-chemical forms of several radionuclides are being investigated in order to characterize the migrating species in a deep geologic repository. Under ground water bicarbonate and carbonate concentration levels, Am(CO3)2 has been observed to be the most important complex while the formation of Am(OH)(CO3)22− has been indicated, stability constants of Am-complexes have been calculated, and a distribution diagram of Am(III) species as a function of pH is presented. Speciation of Tc has been studied using radiochemical and electromigration methods in oxic and anoxic environments; in effective diffusion coefficient of 1.37 × 10−5 cm2 S−1 for ToO4− has been obtained. Preliminary studies on Np(V) indicate that NpO2+ does not form strong complexes with carbonate and bicarbonate ions at ground water concentrations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 15: Symposium D – Scientific Basis for Nuclear Waste Management VI , 1982 , 373
Copyright
Copyright © Materials Research Society 1983

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References

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