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- W1981317791 abstract "The 2-site protolysis no electrostatics surface complexation and cation exchange (2SPNE/CE) model used in previous work to model the sorption of Ni and Zn on Na- and Ca-montmorillonites was applied to sorption edges and isotherms measured for Eu on these two montmorillonite forms. The aim was to further test the applicability of the sorption model on a trivalent element with a more complex aqueous chemistry. An additional reason for choosing Eu was that it is considered to be a good chemical analogue for other lanthanides and trivalent actinides. With site types, site capacities, and protolysis constants fixed at the values in the Ni/Zn studies, all of the measured sorption edge data could be modelled using cation exchange and the monodentate surface species, ≡SSOEu2+, ≡SSOEuOH+ and ≡SSOEu(OH)3−, on the strong site type. However, an additional modelling study showed that the same data were almost equally well described by considering bidentate surface complexes, (≡SSO)2Eu+ and (≡SSO)2Eu(OH)2−, and cation exchange. To model the sorption isotherm measurements up to pH = 7.2, only one additional weak site surface complex was required, ≡SW1OEu2+ for the monodentate case and (≡SW1O)2Eu+ for the bidentate case. Selectivity coefficients are given for Eu3+- Ca2+ and Eu3+- Na+ exchange on the planar sites and surface complexation constants for monodentate and bidentate Eu surface species on the edge sites of montmorillonite." @default.
- W1981317791 created "2016-06-24" @default.
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- W1981317791 date "2002-07-01" @default.
- W1981317791 modified "2023-09-27" @default.
- W1981317791 title "Sorption of Eu on Na- and Ca-montmorillonites: experimental investigations and modelling with cation exchange and surface complexation" @default.
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- W1981317791 doi "https://doi.org/10.1016/s0016-7037(02)00841-4" @default.
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