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7603561 
Journal Article 
Oxidation of CI Acid Red 27 by Chloramine-T in perchloric acid medium: Spectrophotometric, kinetic and mechanistic approaches 
Puttaswamy; Vinod, KN; Gowda, KNN 
2008 
Yes 
Dyes and Pigments
ISSN: 0143-7208
EISSN: 1873-3743 
ELSEVIER SCI LTD 
OXFORD 
78 
2 
131-138 
English 
WOS:000254483100005 
The kinetics of the oxidation of the azo dye C.I. Acid Red 27 (Amaranth) by sodium N-chloro-p-toluenesulfonamide (Chloramine-T, [CAT]) in HClO4 medium were studied spectrophotometrically at 293 K. The reaction rate shows first-order dependence on [CAT](o) and [dye](o) and an inverse-fractional order on [HClO4]. Activation parameters for the composite reaction and the reaction constants involved were computed. The stoichiometry of the reaction was found to be 1: 1 and the oxidation products of the dye were identified as naphthalene and 1,2-naphthoquinone by GC-MS data. The observed results have been explained in terms of a mechanism and a relevant rate law has been deduced. (c) 2007 Elsevier Ltd. All rights reserved.