Ru(III)-EDTA catalyzed oxidation of ascorbic acid by hydrogen peroxide in aqueous solution

Taqui Khan, M. M. ; Shukla, R. S. (1987) Ru(III)-EDTA catalyzed oxidation of ascorbic acid by hydrogen peroxide in aqueous solution Journal of Molecular Catalysis, 39 (2). pp. 139-146. ISSN 0304-5102

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Official URL: http://www.sciencedirect.com/science/article/pii/0...

Related URL: http://dx.doi.org/10.1016/0304-5102(87)80056-1

Abstract

The kinetics of oxidation of ascorbic acid to dehydroascorbic acid by hydrogen peroxide catalyzed by ethylenediaminetetraacetatoruthenate(III) has been studied over the pH range 1.50-2.50, at 30°C and μ=0.1 M KNO3. The reaction has a first-order dependence on ascorbic acid and Ru(III)-EDTA concentrations, an inverse first-order dependence on hydrogen ion concentration, and is independent of hydrogen peroxide concentration in the pH range studied. A mechanism has been proposed in which ascorbate anion forms a kinetic intermediate with the catalyst in a pre-equilibrium step. Ruthenium(III) is reduced to ruthenium(II) in a rate-determining step and is reoxidized with hydrogen peroxide back to the Ru(III) complex in a fast step.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:57837
Deposited On:30 Aug 2011 10:26
Last Modified:30 Aug 2011 10:26

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