A Raman spectroscopy study of hydroxo and carbonato species of the uranyl (VI) ion

Maya, L.; Begun, G. M.

doi:10.1016/0022-1902(81)80625-2

Cited by 84 publications

(76 citation statements)

References 15 publications

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“…For uranyl compounds, this frequency is inversely correlated to the strength of the interaction of U(VI) with the coordinating ligand in the equatorial plane. A stronger interaction between U(VI) and the equatorial ligand results in weaker apical UdO bond and thus a lower OdUdO stretching frequency (52). The calculated ν1 values varied from 861 cm -1 for the aqueous uranyl ion to 652 cm -1 for (UO2)2(OH)3CO3 -.…”

Section: Resultsmentioning

confidence: 99%

Cryogenic Laser Induced Fluorescence Characterization of U(VI) in Hanford Vadose Zone Pore Waters

Wang

Zachara

Yantasee

et al. 2004

Environ. Sci. Technol.

166

141

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Ambient and liquid helium temperature laser-induced time-resolved uranyl fluorescence spectroscopy was applied to study the speciation of aqueous uranyl solutions containing carbonate and phosphate and two porewater samples obtained by ultracentrifugation of U(VI)-contaminated sediments. The significantly enhanced fluorescence signal intensity and spectral resolution found at liquid helium temperature allowed, for the first time, direct fluorescence spectroscopic observation of the higher aqueous uranyl complexes with carbonate: UO2(CO3)2(2-), UO2(CO3)3(4-), and (UO2)2(OH)3CO3-. The porewater samples were nonfluorescent at room temperature. However, at liquid helium temperature, both porewater samples displayed strong, well-resolved fluorescence spectra. Comparisons of the spectroscopic characteristics of the porewaters with those of the standard uranyl-carbonate complexes confirmed that U(VI) in the porewaters existed primarily as UO2(CO3)3(4-) along with a small amount of other minor components, such as dicalcium-urano-tricarbonate complex, Ca2UO2(CO3)3, consistent with thermodynamic calculation. The U(VI)-carbonate complex is apparently the mobile species responsible for the subsurface migration of U(VI), even though the majority of the in-ground U(VI) inventory at the site from which the samples were obtained exists as intragrain U(VI)-silicate precipitates.

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Section: Resultsmentioning

confidence: 99%

Cryogenic Laser Induced Fluorescence Characterization of U(VI) in Hanford Vadose Zone Pore Waters

Wang

Zachara

Yantasee

et al. 2004

Environ. Sci. Technol.

166

141

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“…To date, 14 uranyl silicate minerals have been characterized [39], of which nine have a U:Si ratio of 1:1. The exact structures of these silicates are not completely understood, due to uncertainty in the nature of the water present (H 2 O, H 3 O + , OH À ), but the uranyl ion is generally co-ordinated with five oxygen atoms in the equatorial plane to form a pentagonal bipyramid [40][41][42]. Fig.…”

Section: Resultsmentioning

confidence: 99%

The influence of deposited films on the anodic dissolution of uranium dioxide

Ofori¹,

Keech²,

Noël³

et al. 2010

Journal of Nuclear Materials

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“…The coordination of carbonate ligands with the uranyl ion will cause a decrease in the energy number of the antisymmetric stretching vibration of UO 2 2+ [13,[15][16][17][18][19][20]. Titanium dioxide had a small shoulder in the 900 cm −1 region as shown in Fig.…”

Section: Ftir Spectroscopic Studiesmentioning

confidence: 99%

Carbonate effects on hexavalent uranium removal from water by nanocrystalline titanium dioxide

Wazne

Meng

Korfiatis

et al. 2006

Journal of Hazardous Materials

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A Raman spectroscopy study of hydroxo and carbonato species of the uranyl (VI) ion

Cited by 84 publications

References 15 publications

Cryogenic Laser Induced Fluorescence Characterization of U(VI) in Hanford Vadose Zone Pore Waters

Cryogenic Laser Induced Fluorescence Characterization of U(VI) in Hanford Vadose Zone Pore Waters

The influence of deposited films on the anodic dissolution of uranium dioxide

Carbonate effects on hexavalent uranium removal from water by nanocrystalline titanium dioxide

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