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Sorption studies of actinides/lanthanides onto clay minerals under saline conditions

Schnurr, A.; Schäfer, T.; Marsac, R.; Rabung, T.; Lützenkirchen, J. ORCID iD icon; Geckeis, H.


Actinide retention at clay mineral surfaces is a well established process, which has been intensely investigated in the context of nuclear waste disposal (e.g. Bradbury and Baeyens, 2009). Up to now, however, no mechanistic sorption model exists that reliably describe actinide uptake under ionic strength conditions in groundwater upto high salinity (~ 5 mol/kg). Such conditions are to be expected e.g. in the vicinity of a repository in rock salt formations, in the Jurassic and lower Cretaceous clay rock layers in Northern Germany (Brewitz, 1980) or in sedimentary rocks in Canada (Fritz and Frape, 1982), all identified as potential host rocks for high level nuclear waste disposal. Within the present study lanthanide/actinide ion (Eu(III), Cm(III), U(VI)) interactions with montmorillonite and illite in aqueous solution (I ≤ 4 mol/L NaCl, CaCl2 and MgCl2) in the absence of carbonate are investigated. Batch sorption and time-resolved laser fluorescence spectroscopy (TRLFS) experiments are carried out for a given ionic strength at fixed metal concentration and constant solid to liquid ratio for 3 < pHc < 12 (for MgCl2 solutions up to pHc = 9). ... mehr

Volltext §
DOI: 10.5445/IR/220103001
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nukleare Entsorgung (INE)
Publikationstyp Poster
Publikationsjahr 2015
Sprache Englisch
Identifikator urn:nbn:de:swb:90-AAA2201030018
KITopen-ID: 220103001
HGF-Programm 32.01.01 (POF III, LK 01) Grundl. Unters. - Geochemie v. Actiniden
Veranstaltung 6th International Conference on Clays in Natural and Engineered Barriers for Radioactive Waste Confinement, Bruxelles, Belgium, 23rd - 26th March 2015
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