Kinetic and mechanistic studies of indigocarmine oxidation by chloramine-T and chlorine in acidic buffer media

Venkatesha, B.M. and Ananda, S. and Mahadevappa, D.S. and Gowda, N.M.M. (1995) Kinetic and mechanistic studies of indigocarmine oxidation by chloramine-T and chlorine in acidic buffer media. International Journal of Chemical Kinetics, 27 (7). pp. 663-674.

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Official URL: https://doi.org/10.1002/kin.550270706

Abstract

Oxidations of indigocarmine (IC) by chloramine-T (CAT) and aqueous chlorine (HOCl) in acidic buffer media, pH 2-6, have been kinetically studied at 30 degrees C using spectrophotometry. The CAT reaction rate shows a first-order dependence on IC](o) and an inverse fractional order on p-toluenesulfonamide]. The effect of CAT] on the rate is strongly pH dependent with a variable order of 1-2 on CAT]o in the pH range 6-2. The chlorine reaction rate follows first-order in IC](o) and HOCl](o) each in the pH range 6-2. Addition of halide ions and variation of ionic strength of the medium have no influence on the reaction rate. There is a negative effect of dielectric constant of the solvent. The kinetics of the IC oxidation with CAT at pH 6 and of that with HOCl at pHs 2-6 are similar suggesting similarity in their rate determining steps. A two-pathway mechanism for the CAT reaction and a one-pathway mechanism for the HOCl reaction, consistent with the kinetic data, have been proposed. Activation parameters have been calculated using the Arrhenius and frying plots. (C) 1995 John Wiley and Sons, Inc.

Item Type: Article
Subjects: C Chemical Science > Chemistry
Divisions: Department of > Chemistry
Depositing User: lpa venkatesh user
Date Deposited: 20 May 2021 07:53
Last Modified: 20 May 2021 07:53
URI: http://eprints.uni-mysore.ac.in/id/eprint/16498

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