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- W2549444172 abstract "Adsorption and diffusion experiments of EuIII were performed in Callovo-Oxfordian (COx) clay rock in the presence of EDTA. The predictive model based on binary system parameters (Eu/COx and EDTA/COx) was in good agreement with the results for the Eu/EDTA/COx ternary system. At low EDTA concentrations, the behaviour of EuIII was mainly driven by Eu3+adsorption and complexation by carbonates and EDTA. At higher EDTA concentrations, the behaviour of EuIII was driven by the adsorption of [EuIII-EDTA]− anions. Europium was then used as a probe to estimate the transport of EDTA. Three through-diffusion experiments of EDTA were compared with 14C, Eu and 152Eu tracers. EuIII-EDTA was not quantitatively dissociated by diffusion through the rock. The effective diffusion coefficients quantified De(EuIII-EDTA) = 1.5–1.7 · 1012 m2 s−1 were an order of magnitude lower than that of water, evidencing the anionic exclusion of [EuIII-EDTA]− within the clay rock. Break-through curves and diffusion profiles confirmed retardation due to significant adsorption on the clay rock (Rd(EuIII-EDTA) ∼ 6–14 L kg−1) in comparison with inorganic anions. However, the model based on batch adsorption measurements failed to predict the diffusion results. All experiments displayed an early break-through of EDTA complexes. This behaviour contrasted with results on iron oxides rich sediments, which usually led to higher retardation than expected from the batch studies." @default.
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- W2549444172 date "2017-01-01" @default.
- W2549444172 modified "2023-10-18" @default.
- W2549444172 title "Adsorption and retarded diffusion of EuIII-EDTA− through hard clay rock" @default.
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- W2549444172 doi "https://doi.org/10.1016/j.jhydrol.2016.11.014" @default.
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