An application of near-infrared and mid-infrared spectroscopy to the study of uranyl selenite minerals: derriksite, demesmaekerite, guilleminite and haynesite
Frost, Ray L., Reddy, B. Jagannadha, & Dickfos, Marilla J. (2008) An application of near-infrared and mid-infrared spectroscopy to the study of uranyl selenite minerals: derriksite, demesmaekerite, guilleminite and haynesite. Journal of Near Infrared Spectroscopy, 16(5), pp. 455-469.
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The NIR spectra of the natural uranyl selenite minerals that include derriksite, demesmaekerite, guilleminite and haynesite are examined as a potential indicator of uranium occurring geologic materials at the earth's surface. Near-infrared analysis is complimented with mid-IR studies are used to investigate the coordination of UO22+ and Cu2+ in the uranyl selenites. Bands obtained from the infrared spectra of selenites are interpreted in terms of the stretching vibrations of uranyl, selenite units and OH groups and bending modes. NIR spectra of the uranyl selenite minerals exhibit distinctive characteristics of uranyl ion (UO2)2+absorptions over the range of 11500-8000 cm-1. The high range NIR spectrum of Cu-bearing uranyl derriksite is resolved into two bands, UO22+ 8070 and Cu2+ 7175 cm-1. The effect of lead in demesmaekerite leads to distortion of the spectrum and the NIR bands are observed for uranyl ion at 11305 and 8475 cm-1 and for Cu2+ at 7430 cm-1. The δ U-OH bending vibrations are characterised by a strong absorption feature centred at 1015 cm-1 in haynesite. A significant shift for UOH bending vibrations and the absence of v1 and v3 vibrations of UO22+ at the expense of Cu2+ are reflected in the spectrum of derriksite. The complexity of bands with shifts to low wavenumbers could take place due to the additional cations of Pb and Cu in the structure of demesmaekerite. NIR spectroscopy has proven to be a most useful tool for the identification and distinction between different uranyl selenite minerals.
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|Item Type:||Journal Article|
|Additional Information:||Self-archiving of the author-version is not yet supported by this publisher. For more information, please refer to the journal's website (see link) or contact the author. Author contact details: email@example.com|
|Keywords:||Uranyl selenites, haynesite, guilleminite, demesmaekerite, derriksite, Near, IR and Mid, infrared spectroscopy, hydrogen bonds, (UO2)2+, (SeO3)2, Cu2+|
|Subjects:||Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Colloid and Surface Chemistry (030603)|
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Physical Chemistry not elsewhere classified (030699)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Structural Chemistry and Spectroscopy (030606)
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Science and Technology|
|Copyright Owner:||Copyright 2008 NIR Publications (IM Publications)|
|Deposited On:||11 Nov 2008|
|Last Modified:||29 Feb 2012 23:48|
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