Abstract
This study reveals the micellar effects on the rate of reduction of dithiazone, an azo compound by sulphite ions in a buffer medium of pH 7. The reduction of dithiazone was studied in absence and presence of micellar forming surfactants, Cetyl Trimethyl Ammonium Bromide (CTAB) and Sodium Dodecyl Sulphate (SDS). A 0.1 M cationic surfactant CTAB catalyses the reaction and increases the rate by five times whereas the same concentration of an anionic micelle SDS has completely inhibited the reduction reaction. The significant rate enhancement of this reaction in presence of CTAB micelles is due to the hydrophobic and electrostatic interactions between the substrate, reductant and micelles. The binding constant between the substrate and CTAB micelles has been found to be 329.3 M -1 .
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