Shahwan, T.Sayan, S.Erten, H. N.Black, L.Hallam, K. R.Allen, G. C.2016-02-082016-02-0820000033-8230http://hdl.handle.net/11693/27634The sorption behavior of Cs+, and Ba2+ on natural clay was investigated using ToF-SIMS, XPS, and XRD. The natural clay was composed mainly of chlorite and illite in addition to quartz and calcite. Depth profiling up to 70 Å was performed at 10 Å steps utilizing ToF-SIMS to study the amount of sorbed Cs+ and Ba2+ as a function of depth in the clay matrix. The results suggest that Cs+ and Ba2+ ions were sorbed primarily by ion exchange coupled with hydrolytic sorption. According to ToF-SIMS and XPS results, the total sorbed amount of Ba2+ was larger than that of Cs+. Quantitative determination of the primary cations within the analyzed clay before and after sorption indicated that for Ba2+ sorption, Ca2+, Mg2+ and for Cs+ sorption Ca2+, K+ were the major exchanging ions. The XRD spectra of Ba-sorbed clay contained new peaks that were identified as BaCO3.EnglishBa2+ChloriteCs+IlliteSorptionTof-SIMSXPSXRDCalcium carbonateCesiumSilicon dioxideSodium chloriteAdsorptionClayHydrolysisIon exchangeRadioactive wasteSpectroscopyX ray analysisArticle10.1524/ract.2000.88.9-11.681