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dc.contributor.authorGalunin, E.-
dc.contributor.authorAlba, María D.-
dc.contributor.authorSantos, María J.-
dc.contributor.authorAbrão, T.-
dc.contributor.authorVidal, M.-
dc.identifierdoi: 10.1016/j.jhazmat.2010.12.098-
dc.identifierissn: 0304-3894-
dc.identifier.citationJournal of Hazardous Materials 186: 1930- 1941 (2011)-
dc.description.abstractThe competitive effect of La and Lu (analogues of radionuclides appearing in radioactive waste) in the sorption in four smectites was examined. Sorption and desorption distribution coefficients (Kd; Kd,des), and desorption rates (Rdes) were determined from batch tests in two media: deionized water and, to consider the influence of cement leachates, 0.02molL-1 Ca. The competitive effect was lower when high-affinity sites were available, as in the water medium at the lowest range of initial lanthanide concentration, with high Kd for La and for Lu (5-63×104Lkg-1). Lower Kd was measured at higher initial concentrations and in the Ca medium, where Lu showed a stronger competitive effect. This was confirmed by fitting the sorption data to a two-solute Langmuir isotherm. The desorption data indicated that sorption was virtually irreversible for the scenarios with high sorption, with an excellent correlation between Kd and Kd,des (R2 around 0.9 for the two lanthanides). Assuming that radioactive waste is a mixture of radionuclides, and that Ca ions will be provided by the cement leachates, this would reduce the retention capacity of clay engineered barriers. © 2010 Elsevier B.V.-
dc.description.sponsorshipThis research was supported by grants from the Ministry of Education and Science of Spain (Ministerio de Educación y Ciencia de España) for the Project CTM2008-01147/TECNO, from DGICYT for the Project CTQ2007-63297, and from EC for the Project funded within the 6th Framework Programme as the HRM Activity under the Contract MRTN-CT-2006-035957. Besides, the authors would like to thank Dr. A. Padró for his technical help and assistance in the ICP-OES and ICP-MS analyses. SEM-EDX analyses were carried out at the Instituto Ciencia de los Materiales de Sevilla (CICIC).  -
dc.titleExamination of competitive lanthanide sorption onto smectites and its significance in the management of radioactive waste-
dc.description.versionPeer Reviewed-
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