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The application of visible absorption spectroscopy to the analysis of uranium in aqueous solutions.

Authors
  • Colletti, L M1
  • Copping, R1
  • Garduno, K1
  • Lujan, E J W1
  • Mauser, A K2
  • Mechler-Hickson, A3
  • May, I4
  • Reilly, S D5
  • Rios, D1
  • Rowley, J1
  • Schroeder, A B3
  • 1 Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87544, USA.
  • 2 Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87544, USA; The University of New Mexico, Albuquerque, NM 87131, USA. , (Mexico)
  • 3 Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87544, USA; The University of Wisconsin-Madison, Madison, WI 53715, USA.
  • 4 Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87544, USA. Electronic address: [email protected]
  • 5 Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87544, USA. Electronic address: [email protected]
Type
Published Article
Journal
Talanta
Publication Date
Dec 01, 2017
Volume
175
Pages
390–405
Identifiers
DOI: 10.1016/j.talanta.2017.07.051
PMID: 28842008
Source
Medline
Keywords
License
Unknown

Abstract

Through assay analysis into an excess of 1M H2SO4 at fixed temperature a technique has been developed for uranium concentration analysis by visible absorption spectroscopy over an assay concentration range of 1.8-13.4mgU/g. Once implemented for a particular spectrophotometer and set of spectroscopic cells this technique promises to provide more rapid results than a classical method such as Davies-Gray (DG) titration analysis. While not as accurate and precise as the DG method, a comparative analysis study reveals that the spectroscopic method can analyze for uranium in well characterized uranyl(VI) solution samples to within 0.3% of the DG results. For unknown uranium solutions in which sample purity is less well defined agreement between the developed spectroscopic method and DG analysis is within 0.5%. The technique can also be used to detect the presence of impurities that impact the colorimetric analysis, as confirmed through the analysis of ruthenium contamination. Finally, extending the technique to other assay solution, 1M HNO3, HCl and Na2CO3, has also been shown to be viable. Of the four aqueous media the carbonate solution yields the largest molar absorptivity value at the most intensely absorbing band, with the least impact of temperature.

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