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Raman study of cation effect on sulfate vibration modes in solid state and in aqueous solutions

Authors

  • Kawther Ben Mabrouk,

    Corresponding author
    1. Université de Lorraine, Laboratoire Matériaux Optiques, Photonique et Systèmes, Metz, France
    2. Supélec, Laboratoire Matériaux Optiques, Photonique et Systèmes, Metz, France
    3. Université de Tunis, Laboratoire Dynamique Moléculaire et Matériaux Photoniques, Ecole Supérieure des Sciences et Techniques de Tunis, Tunis, Tunisia
    • Correspondence to: Kawther Ben Mabrouk, Université de Lorraine, Laboratoire Matériaux Optiques, Photonique et Systèmes, EA 4423 2, rue Edouard Belin, 57070 Metz, France. E-mail: kawther.benmabrouk@supelec.fr

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  • Thomas H. Kauffmann,

    1. Université de Lorraine, Laboratoire Matériaux Optiques, Photonique et Systèmes, Metz, France
    2. Supélec, Laboratoire Matériaux Optiques, Photonique et Systèmes, Metz, France
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  • Hassen Aroui,

    1. Université de Tunis, Laboratoire Dynamique Moléculaire et Matériaux Photoniques, Ecole Supérieure des Sciences et Techniques de Tunis, Tunis, Tunisia
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  • Marc D. Fontana

    1. Université de Lorraine, Laboratoire Matériaux Optiques, Photonique et Systèmes, Metz, France
    2. Supélec, Laboratoire Matériaux Optiques, Photonique et Systèmes, Metz, France
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Abstract

Raman spectra of potassium, sodium, and ammonium sulfates (K2SO4, Na2SO4, and (NH4)2SO4) are reported and analyzed. These sulfates have been investigated under two states: solid (anhydrous and hydrated) salts and aqueous solutions. The effects of monovalent ions (K+, Na+, and NH4+) and hydration on the position of Raman lines assigned to internal vibrations of sulfate anion SO42− are discussed. In solid salts, the line position of each Raman peak is shown to decrease with increasing radius of the cation. The main ν1 mode of sulfate molecule is particularly affected. It is emphasized that this sensitivity in solid sulfates vanishes in aqueous solutions. As a consequence, this mode can be probed by Raman spectroscopy as the main signature of SO42− to determine its concentration within a single calibration. Copyright © 2013 John Wiley & Sons, Ltd.

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