title: N-substituted phenothiazines as redox indicators in titrations with chloramine-T and chloramine-B.
abstract: Profenamine hydrochloride, fluphenazine dihydrochloride, trifluopromazine hydrochloride, cyamepromazine maleate, perphenazine dihydrochloride and mepazine hydrochloride are proposed as redox indicators in the titration of hydroquinone, metol and ascorbic acid with chloramine-T and chloramine-B in sulphuric, hydrochloric and acetic acid media. They give a sharp reversible colour change at the equivalence point. A simple but accurate method for the determination of hydroquinone, metol and ascorbic acid is described. The conditional potentials and molar absorptivities of the indicators and redox potential of chloramine-B are reported.
authors.affiliation: Department of Post-graduate Studies and Research in Chemistry, University of Mysore, Manasa Gangotri, Mysore, India.
authors.forename: H S
authors.initials: HS
authors.lastname: Gowda
authors.forename: B M
authors.initials: BM
authors.lastname: Mohan
authors.forename: S A
authors.initials: SA
authors.lastname: Ahmed