Quantification of hydroxide in aqueous solutions by Raman spectroscopy

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Quantification of hydroxide in aqueous solutions by Raman spectroscopy is complicated by the fact that the O-H stretching band of hydroxide is overlapped by the broad, symmetric O-H stretching band of water. This overlap is further complicated by the fact that the shape of the O-H stretching band of water is strongly influenced by the concentration of hydroxide. The O-H stretching band of water is believed to consist of five components that result from differing configurations of intramolecular hydrogen bonding. The Raman spectral region from 300 to 4,450 cm{sup {minus}1} was investigated for NaOH solutions ranging in concentration from 0.2 ... continued below

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31 p.

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Shaffer, C.D. December 1, 1997.

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  • Bettis Atomic Power Laboratory
    Publisher Info: Bettis Atomic Power Lab., West Mifflin, PA (United States)
    Place of Publication: West Mifflin, Pennsylvania

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Quantification of hydroxide in aqueous solutions by Raman spectroscopy is complicated by the fact that the O-H stretching band of hydroxide is overlapped by the broad, symmetric O-H stretching band of water. This overlap is further complicated by the fact that the shape of the O-H stretching band of water is strongly influenced by the concentration of hydroxide. The O-H stretching band of water is believed to consist of five components that result from differing configurations of intramolecular hydrogen bonding. The Raman spectral region from 300 to 4,450 cm{sup {minus}1} was investigated for NaOH solutions ranging in concentration from 0.2 to 50 weight percent. At approximately 5 weight percent NaOH, a distinct shoulder appears on the high energy side of the O-H stretching band of water. As the NaOH concentration increases, this shoulder becomes a sharp distinct band at 3,600 cm{sup {minus}1} which is still not resolved from the O-H stretching band of water. As the O-H stretching band of hydroxide increases, the O-H stretching band of water broadens and its contour becomes smoother. By curve fitting five Gaussian functions to the O-H stretching band of water, the asymmetric band due to hydroxide was extracted from the composite band of the NaOH solution. The curve fitting routine resulted in a linear relationship for the area of the hydroxide band in the concentration range from 5 to 50 weight percent NaOH. The uncertainty in the curve fitting at concentrations below 5 weight percent was too large to establish a reliable calibration curve. Below 5 weight percent NaOH, direct spectral subtraction of the water band from the NaOH solution band resulted in a linear relationship in the range of 5 down to 0.2 weight percent NaOH. The peak shape obtained for the hydroxide band by the two different techniques was very similar. A comparison of the results obtained from peak fitting and spectral subtraction is presented.

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31 p.

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OSTI as DE98002720

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  • Pittsburgh conference on analytical and applied spectroscopy, New Orleans, LA (United States), 1-6 Mar 1998

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  • Other: DE98002720
  • Report No.: WAPD-T--3169
  • Report No.: CONF-980310--
  • Grant Number: AC11-93PN38195
  • Office of Scientific & Technical Information Report Number: 634000
  • Archival Resource Key: ark:/67531/metadc691791

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • December 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • May 18, 2016, 5:06 p.m.

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Shaffer, C.D. Quantification of hydroxide in aqueous solutions by Raman spectroscopy, article, December 1, 1997; West Mifflin, Pennsylvania. (digital.library.unt.edu/ark:/67531/metadc691791/: accessed September 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.