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    Spectroscopic Determination of Chromium(VI) during the Reduction of Chromium(VI) to Chromium(III)

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    Issue Date
    1991-07
    Author
    Maxcy, Thomas A.
    Willhite, G. Paul
    Green, Don W.
    Mertes, Kristin Bowman
    Publisher
    Society for Applied Spectroscopy
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
    Metadata
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    Abstract
    Reduction of chromium(VI) to chromium(III) by thiourea between pH 3.0 and 5.5 is a key aspect of the chromium(VI)/thiourea/polyacrylamide gel polymer system used in enhanced oil recovery processes. A method has been developed to determine chromium(VI) concentration during the reduction of chromium(VI) to chromium(III) in this pH range. The reduction reaction is run in the presence of an acetic acid/sodium acetate buffer which reacts with the chromium(III) produced and prevents the formation of a brown precipitate which forms in the absence of the buffer. With interference from the precipitate eliminated, chromium(VI) concentration is determined from the visible absorbance of the reaction mixture and the unique molar absorptivity spectra of the five chromium species present in the reaction mixture. An average error of approximately 1% between known and measured chromium(VI) concentrations was demonstrated over a chromium(VI) concentration range from 0.0005 to 0.0025 M.
    Description
    This is the published version. Copyright 1991 Society for Applied Spectroscopy
    URI
    http://hdl.handle.net/1808/19000
    DOI
    https://doi.org/10.1366/0003702914336291
    Collections
    • Chemical & Petroleum Engineering Scholarly Works [173]
    Citation
    Maxcy, Thomas A., G. Paul Willhite, Don W. Green, and Kristin Bowman Mertes. "Spectroscopic Determination of Chromium(VI) during the Reduction of Chromium(VI) to Chromium(III)." Applied Spectroscopy Appl Spectrosc 45.6 (1991): 1036-040. http://dx.doi.org/10.1366/0003702914336291

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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