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Bilan prospectif sur l’influence de la complexation par la matière organique sur l’effet accélérant ou retard du transport des radionucléides : cas de la rétention des substances humiques

Abstract : This document takes a prospective stock of the natural organic matter influence on the possible effects on radionuclide migration, as well as a brief critical analysis of the literature data. A comparison with the retention of the “simple” organic complexants is done in order to fix the limit of the “simplistic” analogies done in the literature very often. It appears that the magnitude of the effects is function of the residence time in the medium, and of the possibilities for the organic complexes to be retained on the mineral surfaces. The contact time between radionuclides and the natural organic matter is also an influent parameter, as it influences part of the reversibility of this interaction vis-a-vis surface retention. Modelling of the metal-organic-surface systems is only satisfying up to now when accounting fractions of organic matter that are less susceptible to form colloidal aggregates, i.e., fulvic acids. These non-aggregated fractions could be considered as simple ligands in a first approximation. Conversely, when it comes to aggregated colloids of organic origin, i.e., humic acids, modelling are limited by the lack of theoretical understanding of their structure and of their evolution in response to geochemical condition variations, as ionic strength (harsh meteoric events), acidity or water composition (non-saturated water table).
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https://hal-cea.archives-ouvertes.fr/cea-02285992
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Submitted on : Friday, September 13, 2019 - 12:06:42 PM
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Pascal E. Reiller. Bilan prospectif sur l’influence de la complexation par la matière organique sur l’effet accélérant ou retard du transport des radionucléides : cas de la rétention des substances humiques. [Rapport de recherche] CEA-R-6255, CEA. 2010, pp.72. ⟨cea-02285992⟩

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