Add time:08/06/2019         Source:sciencedirect.com

The application of a multi-site ion-exchange (MSIE) model to the prediction of contaminant behaviour onto soils or sediments requires a coherent adsorption database. Following the same approach exposed in preceding works on smectite (Siroux et al., Appl. Geochem. 87, 167; Wissocq et al., Appl. Geochem., 93, 167), a database is here implemented to allow modelling the adsorption of radionuclides 90Sr and 137Cs onto Na-illite, one of the major clay mineral encountered in the terrestrial environment. This database allows describing the adsorption properties of Sr2+ and Cs+ competing with major cations H+ — considered as the reference cation — and Na+ onto an Na-illite. To obtain the adsorption site capacities and selectivity coefficients of illite sites for Na+ towards H+, a saturation curve of Na+ on Na-conditioned illite was acquired. Adsorption isotherms issued from literature have been reinterpreted using the MSIE model to obtain the adsorption properties of Sr2+ and Cs+ onto purified and Na-conditioned illite. Afterwards, the predictability and robustness of the database were verified simulating experimental adsorption of Sr2+ and Cs+ onto Na-illite/Na-smectite mixtures.

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