Die fluoreszenzspektren von uranmineralien im filtrierten ultravioletten licht

Haberlandt, H.; Hernegger, F.; Scheminzky, Ferdinand

doi:10.1016/0371-1951(50)80017-6

Cited by 24 publications

(10 citation statements)

References 3 publications

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“…[45] The information in this spectral region reveals the oxidation states of uranium and can fundamentally be used to fingerprint minerals containing uranium. [46,47] The absorption properties of U 4+ and U 6+ are well known. [45] The principal absorption bands of U 4+ are in the 22 000-8000 cm −1 region.…”

Section: Resultsmentioning

confidence: 99%

A Raman spectroscopic study of the uranyl mineral rutherfordine—revisited

Frost

Čejka

2009

J Raman Spectroscopy

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The molecular structure of the uranyl mineral rutherfordine has been investigated by the measurement of the near-infrared (NIR) and Raman spectra and complemented with infrared spectra including their interpretation. The spectra of rutherfordine show the presence of both water and hydroxyl units in the structure as evidenced by IR bands at 3562 and 3465 cm −1 (OH) and 3343, 3185 and 2980 cm −1 (H 2 O). Raman spectra show the presence of four sharp bands at 3511, 3460, 3329 and 3151 cm −1 . Corresponding molecular water bending vibrations were only observed in both Raman and infrared spectra of one of two studied rutherfordine samples. The second rutherfordine sample studied contained only hydroxyl ions in the equatorial uranyl plane and did not contain any molecular water. The infrared spectra of the (CO 3 ) 2− units in the antisymmetric stretching region show complexity with three sets of carbonate bands observed. This combined with the observation of multiple bands in the (CO 3 ) 2− bending region in both the Raman and IR spectra suggests that both monodentate and bidentate (CO 3 ) 2− units may be present in the structure. This cannot be exactly proved and inferred from the spectra; however, it is in accordance with the X-ray crystallographic studies. Complexity is also observed in the IR spectra of (UO 2 ) 2+ antisymmetric stretching region and is attributed to non-identical UO bonds. U-O bond lengths were calculated using wavenumbers of the ν 3 and ν 1 (UO 2 ) 2+ and compared with data from X-ray single crystal structure analysis of rutherfordine. Existence of solid solution having a general formula (UO 2 )(CO 3 ) 1−x (OH) 2x .yH 2 O (x, y ≥0) is supported in the crystal structure of rutherfordine samples studied. Copyright

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Section: Resultsmentioning

confidence: 99%

A Raman spectroscopic study of the uranyl mineral rutherfordine—revisited

Frost

Čejka

2009

J Raman Spectroscopy

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“…It has been long known that some uranyl salts exhibit emission with distinctive spectral characteristics. [1][2][3][4][5][6][7][8][9][10][11][12] The literature reports that the emission wavelength and intensity are different for different uranyl compounds. 5,8,24,25,38,[45][46][47] The wavelength variability of different uranyl compounds has been attributed to the effect of ligands and of the media.…”

Section: Results and Discusssionmentioning

confidence: 99%

Parametric Investigation of Laser-Induced Fluorescence of Solid-State Uranyl Compounds

Wang

Monts

2008

J. Phys. Chem. A

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The combination of remote/standoff sensing and laser-induced fluorescence (LIF) spectroscopy shows potential for detection of uranyl (UO2(2+)) compounds. Uranyl compounds exhibit characteristic emission in the 450-600 nm (22,200 to 16,700 cm(-1)) spectral region when excited by wavelengths in the ultraviolet or in the short-wavelength portion of the visible spectrum. We report a parametric study of the effects of excitation wavelength [including 532 nm (18,797 cm(-1)), 355 nm (28,169 cm(-1)), and 266 nm (37,594 cm(-1))] and excitation laser power on solid-state uranium compounds. The uranium compounds investigated include uranyl nitrate, uranyl sulfate, uranyl oxalate, uranium dioxide, triuranium octaoxide, uranyl acetate, uranyl formate, zinc uranyl acetate, and uranyl phosphate. We observed the characteristic uranyl fluorescence spectrum from the uranium compounds except for uranium oxide compounds (which do not contain the uranyl moiety) and for uranyl formate, which has a low fluorescence quantum yield. Relative uranyl fluorescence intensity is greatest for 355 nm excitation, and the order of decreasing fluorescence intensity with excitation wavelength (relative intensity/laser output) is 355 nm > 266 nm > 532 nm. For 532 nm excitation, the emission spectrum is produced by two-photon excitation. Uranyl fluorescence intensity increases linearly with increasing laser power, but the rate of fluorescence intensity increase is different for different emission bands.

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“…No interference was encountered from chloride, nitrate, or sulfate at 50-1 ratios. Because salicylidene-o-aminophenol had previously been prepared in this laboratory and formed a fluorescent chelate with aluminum (6), this type of ligand was chosen for the present series of experiments. Holzbecker (7,8) has also studied the 2,2'-dihydroxyazomethines and recommends salicylidene-oaminophenol as a reagent for aluminum.…”

Section: Resultsmentioning

confidence: 99%

“…Other fluorometric methods for the determination of uranium have employed silica gel (18), uranium-HCl complexes (8), changes in fluorescence intensity as a function of calcium (16) and chromium (17) concentration, UCI3 in LaCl3 (3), and direct measurements of the fluorescence of minerals (4,6). However, these determinations are no more desirable than the sodium fluoride method because of experimental complexities or, for silica gel (18), because it is only semiquantitative.…”

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confidence: 99%