SummaryThe pH dependent sorption of Cm(III) onto alkali Feldspars (albite and orthoclase) is investigated by time resolved laser fluorescence spectroscopy (TRLFS) in the pH range from 3.4 to 9.4. Three single components are calculated from the raw spectra for both feldspar systems. The first component which corresponds to the Cm(III) aquo ion has a peak maximum at 593.8 nm and a fluorescence emission lifetime of 68±4 μs. This lifetime corresponds to a Cm(III) coordination of nine water molecules in the first coordination sphere of the actinide ion. The second component with a peak maximum at 601.4 nm corresponds to an adsorbed species. Its lifetime of 107±3 μs indicates a reduction of coordinating HIn a further set of experiments the Cm(III) sorption onto albite which is altered at pH 6.0 and pH 9.0 is also investigated by TRLFS. Independent of the dissolution and different surface morphologies caused by the alteration process the same Cm(III) species are formed as found for the sorption onto the untreated albite surface. With regard to the clarification of a feldspar dissolution mechanism the TRLFS results of the Cm(III) sorption onto altered feldspar surfaces give no evidence for a dissolution-reprecipitation based alteration mechanism.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.