Studies of the physico-chemical properties on the transuranian elements in connection with the migration phenomenon in the geosphere
The properties of transuranium elements, mainly Pu, Np, and Am, have been investigated in terms of complexation by OH and CO(3) ligands in aqueous solution. The aim of the research was to identify the species which are formed in given physico-chemical conditions (ionic strength, concentration, etc.) and to produce a set of thermodynamical data relevant to the system under investigation. The transfer of tritiated water, caesium and strontium through highly compacted clay has also been studied, and values of diffusion coefficients are given. The diffusion of Sr is linked to some extent with precipitation processes. Finally, CONDIMENT, a code for the computation of ion migration and diffusion in areas close to radwaste storage facilities, has been set up and developed. It can be coupled with other codes such as METIS, which models the transfer of radionuclides into the biosphere. Different cases have been considered and the results are satisfactory. However, the effects of organic compounds (e.g. humic substances), for which at present no reliable thermodynamic formation constants exist, need to be assessed.
Bibliographic Reference: EUR 13673 EN (1991) 134 pp., FS, ECU 11.25
ISBN: ISBN 92-826-2907-4
Record Number: 199111480 / Last updated on: 1994-12-02
Original language: en
Available languages: en