MIGRATION BEHAVIOUR AND CHEMICAL SPECIATION OF NP AND AM UNDER NUCLEAR WASTE REPOSITORY CONDITIONS
The report deals with laboratory scale experiments investigating the behaviour of neptunium and americium in a natural clayey material surrounding typical clay formations and salt domes. In the case of a glauconitic sand and under oxic conditions, almost all the Np-237 activity leached out from the waste matrix was retained in the column. To acquire a better understanding of this phenomenon, we investigated the speciation of Np in groundwater by electromigration. The results seem to indicate the presence of microcolloids, probably due to the adsorption of the radionuclides on pre-existing particulates. Migration experiments of Am in brine indicated a saturation phenomenon of the soil, governed by a chromatographic movement of either microcolloids or soluble chlorocomplexes.
Bibliographic Reference: 1ST INTERNATIONAL CONFERENCE ON THE CHEMISTRY AND TECHNOLOGY OF LANTHANIDES AND ACTINIDES, VENEZIA (ITALY), SEPT. 5-10, 1983 + PAPER ORA E-31226. ALSO PUBL IN: INORGANICA CHIMICA ACTA, VOL. 95 (1984), PP. 1-3
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Record Number: 1989122096200 / Last updated on: 1987-01-01
Available languages: en