COMMISSION ON RADIOCHEMISTRY AND NUCLEAR TECHNIQUES
(V.7)
Number: 570/27/98
Title: Effect of humic substances on the environmental migration
of radionuclides
Coordinator(s): P.
Benes
Completion Date: 2001 - project abandoned
Objective:
Migration of radionuclides in environmental media and in engineered
barriers has long been studied with the aim to understand and predict
the movement of radionuclides from their sources and the environmental
effects of radionuclides. Humic substances affect transport of radionuclides
either by formation of complexes with radionuclides in water, thereby
changing their speciation and behavior in migration (diffusion, dispersion
and uptake by solid phase), or by adsorption on the solid phase of the
migration medium, whose sorption properties toward radionuclides are
thus changed. Quite a number of data were obtained and many papers were
published on these phenomena.
The project aims at critical evaluation of the state of art of knowledge
in this field. The following main topics will be analyzed:
- complexation of radionuclides with humic substances
- effect of humic substances on the uptake of radionuclides by natural
solid phases
- effect of humic substances on the migration of radionuclides in
surface waters, ground waters, soils and engineered barriers
- mathematical modeling of these phenomena.
Progress:
project abandoned
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