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Título : | Effect of major cation water composition on the ion exchange of Np(V) on montmorillonite: NpO2 + –Na+–K+–Ca2+–Mg2+ selectivity coefficients |
Autor : | Benedicto, Ana Begg, James Zhao, Phihong Kersting, Annie Missana, Tiziana Zavarin, Mavrik |
Palabras clave : | Neptunium Selectivity coefficient Clay ionic exchange |
Fecha de publicación : | jun-2014 |
Editorial : | ELSEVIER |
Citación : | Ana Benedicto, James D. Begg, Pihong Zhao, Annie B. Kersting, Tiziana Missana, Mavrik Zavarin, Effect of major cation water composition on the ion exchange of Np(V) on montmorillonite: NpO2 + –Na+–K+–Ca2+–Mg2+ selectivity coefficients, Applied Geochemistry 47 (2014) 177–185. |
Resumen : | 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(SEL(Np, Na)=-0.2; log(SEL(Np, K)=-0.46; log(SEL(Np, Ca)=-0.57; log(SEL(Np, Mg)=-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. |
URI : | http://dx.doi.org/10.1016/j.apgeochem.2014.06.003 http://documenta.ciemat.es/handle/123456789/3283 |
Aparece en las colecciones: | Artículos de Fisión Nuclear
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