Raman Spectra of Tungsten-Bearing Solutions

Raman spectroscopy at 25 °C was performed to analyze speciation in quenched solutions after experiments on sodium tungstates and sodium tungstate bronze dissolution at t =500 °C, p =1000 bar. The experiments were conducted under different oxidation-reduction conditions in sodium chloride solution me...

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Bibliographic Details
Published in:Journal of solution chemistry 2010-10, Vol.39 (10), p.1549-1561
Main Authors: Redkin, Alexander F., Bondarenko, Galina V.
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Condensed Matter Physics
Dissolution
Geochemistry
Industrial Chemistry/Chemical Engineering
Inorganic Chemistry
Mathematical models
Oceanography
Oxidation-Reduction
Physical Chemistry
Quenching (cooling)
Sodium tungstate
Speciation
Spectra
Tungstates
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Summary:Raman spectroscopy at 25 °C was performed to analyze speciation in quenched solutions after experiments on sodium tungstates and sodium tungstate bronze dissolution at t =500 °C, p =1000 bar. The experiments were conducted under different oxidation-reduction conditions in sodium chloride solution media. The spectra of the quenched solutions were different from those of the reference solutions of 0.02 mol⋅kg −1 W(VI) (H 2 O) in the pH range 2.3–7.2. Thermodynamic models were established and the fields of predominance of different isopolytungstate species at 25–50 °C were determined. The experimental results of tungstate dissolution demonstrates that reduced tungstate solutions may contain a significant amount of tungsten species with valence states lower than W(VI).
ISSN:0095-9782
1572-8927
DOI:10.1007/s10953-010-9595-9