Influence of the Partial-pressure of Oxygen On the Redox Chemistry of Multivalent Elements in Molten Sodium Tetraborate
(1992) Journal of Applied Electrochemistry — Vol. 22, n° 3, p. 293-300 (1992)
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- Abstract
- Voltammetric determinations based on current measurements have been developed in order to allow an in situ evaluation of the redox ratios of multivalent elements in molten sodium tetraborate. The same technique has been used to study the influence of the partial pressure of oxygen in the gaseous atmosphere on the redox properties of sodium tetraborate melts. Experiments were carried out at 1273 K in solutions of chromium with oxidation states VI and III and of antimony with oxidation states V and III, the P(O2) values ranged from 5 x 10(-5) atm to 1 atm. Log [Ox]/[Red] plotted against log P(O2) shows linear relationships with slopes of 0.72 and 0.54 in the case of chromium and antimony solutions, respectively. These values lie close to the theoretical values of 0.75 and 0.50, respectively, which are deduced assuming conditions of equilibrium between oxygen and the solute. In agreement with these results, voltammetric and potentiometric determinations confirm Nernstian behaviour of the oxygen-oxide redox system.
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Claes, P., Bacanamwo, Z., & Glibert, J. (1992). Influence of the Partial-pressure of Oxygen On the Redox Chemistry of Multivalent Elements in Molten Sodium Tetraborate. Journal of Applied Electrochemistry, 22(3), 293-300. https://doi.org/10.1007/BF01030191 (Original work published 1992)