EFFECT OF PHTHALATES ON THE MIGRATION BEHAVIOUR OF Am(III) AND Eu(III) IN CEMENTITIOUS MATERIALS - CEA - Commissariat à l’énergie atomique et aux énergies alternatives Accéder directement au contenu
Communication Dans Un Congrès Année : 2023

EFFECT OF PHTHALATES ON THE MIGRATION BEHAVIOUR OF Am(III) AND Eu(III) IN CEMENTITIOUS MATERIALS

Résumé

Small organic molecules as degradation products from organic waste constituents or from cement additives may enhance the mobility of radionuclides in repositories for nuclear wastes. Here, we investigated the impact of phthalate ions on the migration behaviour of 241Am and 152Eu in hardened cement paste (HCP) with batch sorption experiments. In the absence of organics, 241Am/152Eu sorb strongly on HCP with Rd values of 10^5 to 10^6 L kg-1. Above a no-effect level of ~10-3 mol L-1 phthalate, a distinct decrease of the An(III)/Ln(III) sorption was observed with sorption reduction factors of 100 to 1000 at phthalate concentrations of 10-1 mol L-1. This sorption reduction is attributed to the destabilization/dissolution of C-S-H due to increasing Ca-complexation by phthalate in solution. These results and ongoing diffusion experiments indicate an increase in the mobility of 241Am/152Eu in cementitious barriers with increasing phthalate concentrations.
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Dates et versions

cea-04523981 , version 1 (27-03-2024)

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  • HAL Id : cea-04523981 , version 1

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Naila Ait-Mouheb, Guido Deissmann, Pierre Henocq, Nathalie Mace, Dirk Bosbach. EFFECT OF PHTHALATES ON THE MIGRATION BEHAVIOUR OF Am(III) AND Eu(III) IN CEMENTITIOUS MATERIALS. Joint 6th International Workshop on Mechanisms and Modelling of Waste / Cement Interactions & EURAD –WP CORI Workshop, Nov 2023, Prague, Czech Republic. ⟨cea-04523981⟩
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