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• W2078043684 abstract "Abstract Np(V) sorption was examined in pH 4.5 colloidal suspensions of nominally homoionic montmorillonite (Na-, K-, Ca- and Mg-montmorillonite). Ionic exchange on permanent charge sites was studied as a function of ionic strength (0.1, 0.01 and 0.001 M) and background electrolyte (NaCl, KCl, CaCl2 and MgCl2). An ion exchange model was developed using the FIT4FD program, which considered all experimental data simultaneously: Np sorption data, major cation composition of the electrolyte and associated uncertainties. The model was developed to be consistent with the ion exchange selectivity coefficients between the major cations reported in the literature and led to the following recommended selectivity coefficients for Np(V) ion exchange according to the Vanselow convention: log K V Na + NpO 2 + = - 0.20 , log K V K + NpO 2 + = - 0.46 , log K V Ca 2 + NpO 2 + = - 0.57 , log K V Mg 2 + NpO 2 + = - 0.57 . Both the experimental data and the estimated selectivity coefficients in this study are consistent with the limited Np(V) ion exchange and sorption data reported in the literature. The results indicate that, as expected, low ionic strengths favor Np(V) sorption when ion exchange is the main sorption mechanism (i.e. acidic to neutral pHs) and that the divalent cations Ca2+ and Mg2+ may be important in limiting Np(V) ionic exchange on montmorillonite." @default.
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• W2078043684 date "2014-08-01" @default.
• W2078043684 modified "2023-09-30" @default.
• W2078043684 title "Effect of major cation water composition on the ion exchange of Np(V) on montmorillonite: NpO2+–Na+–K+–Ca2+–Mg2+ selectivity coefficients" @default.
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• W2078043684 doi "https://doi.org/10.1016/j.apgeochem.2014.06.003" @default.
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