Abstract
Solubility studies show that trivalent f-element carbonate compounds are the predominant solids that primarily limit the soluble metal ion concentration under environmental conditions. We systematically investigated the spectroscopic characteristics of a series of solid f-element (Eu and 243Am) carbonates. Varying pH, ionic strength, and carbonate concentration results in the formation of M(OH) 3, MOHCO 3, M 2(CO 3) 3·nH 2O, and NaM(CO 3) 2·nH 2O, where M=Eu(III) or Am(III). Solids were characterized by FTIR, fluorescence, and EXAFS spectroscopies that determined and confirmed the coordination environment, and by their individual X-ray diffraction powder patterns. The number of coordinated crystal waters was determined to be 2–3 for Eu 2(CO 3) 3·nH 2O and 5 for NaEu(CO 3) 2·nH 2O using thermogravimetric/differential thermal analysis and fluorescence lifetime. We report studies of the fluorescence of Am(III) and the effect of carbonate coordination on the 5D 1→ 7F 1 transition.
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