Spectroscopic Identification of Ternary Cm−Carbonate Surface Complexes

Autor:	Clemens Walther, B. Baeyens, M. H. Bradbury, Thorsten Stumpf, Maria Marques Fernandes
Rok vydání:	2010
Předmět:	Curium Surface Properties Spectrum Analysis Carbonates Analytical chemistry Fluorescence spectrometry chemistry.chemical_element Sorption General Chemistry chemistry.chemical_compound Adsorption chemistry Aluminum Oxide Environmental Chemistry Kaolinite Carbonate Spectroscopy Ternary operation
Zdroj:	Environmental Science & Technology. 44:921-927
ISSN:	1520-5851 0013-936X
DOI:	10.1021/es902175w
Popis:	The influence of dissolved CO(2) on the sorption of trivalent curium (Cm) on alumina (gamma-Al(2)O(3)) and kaolinite was investigated by time resolved laser fluorescence spectroscopy (TRLFS) using the optical properties of Cm as a local luminescent probe. Measurements were performed at T < 20 K on Cm loaded gamma-Al(2)O(3) and kaolinite wet pastes prepared in the absence and presence of carbonate in order to pictorially illustrate any changes through a direct comparison of spectra from both systems. The red-shift of excitation and emission spectra, as well as the increase of fluorescence lifetimes observed in the samples with carbonate, clearly showed the influence of carbonate and was fully consistent with the formation of Cm(III) surface species involving carbonate complexes. In addition, the biexponential decay behavior of the fluorescence lifetime indicated that at least two different Cm(III)-carbonate species exist at the mineral-water interface. These results provide the first spectroscopic evidence for the formation of ternary Cm(III)-carbonate surface complexes.
Databáze:	OpenAIRE
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