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Properties and Mobilities of Actinide Colloids in Geologic Systems

Published online by Cambridge University Press:  15 February 2011

U. Olofsson ,
B. Allard ,
B. Torstenfelt  and
K. Andersson
U. Olofsson
Affiliation:
Department of Nuclear Chemistry, Chalmers University of Technology, S-412 96Göteborg, Sweden
B. Allard
Affiliation:
Department of Nuclear Chemistry, Chalmers University of Technology, S-412 96Göteborg, Sweden
B. Torstenfelt
Affiliation:
Department of Nuclear Chemistry, Chalmers University of Technology, S-412 96Göteborg, Sweden
K. Andersson
Affiliation:
Department of Nuclear Chemistry, Chalmers University of Technology, S-412 96Göteborg, Sweden
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Extract

The interaction between radionuclides in solution and exposed geologic media, e.g. in connection with underground storage of radioactive waste, is largely determined by the chemical properties of the system. The mobility of radionuclides in contact with low-capacity minerals would depend on the chemical state of the element (e.g. degree of hydrolysis, formation of organic and inorganic complexes, etc.). Particularly for the actinides in their lower oxidation states (III, IV), however, would a formation of colloid particles be feasible in the groundwater environment. These colloids could be either true radiocolloids, i.e. aggregates of the radionuclide itself, or pseudocolloids, i.e. colloid material already present in the groundwater, onto which the radionuclide has sorbed. These colloidal particles may be very poorly sorbed on water exposed geologic media in comparison with radionuclides in true solution. Studies on the formation and properties of some actinide colloids (Am, Np, Pu) are discussed in this paper.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 11: Symposium – Scientific Basis for Nuclear Waste Management V , 1981 , 755
Copyright
Copyright © Materials Research Society 1982

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References

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