title: Cathodic stripping voltammetry of copper-complexed reactive dyes at a hanging mercury drop electrode: Reactive violet 5.
abstract: Reactive Violet 5 and its hydrolysis product, which is produced as a side product in the dyeing process, can be determined in an admixture at sub-ppb levels by cathodic stripping voltammetry because the potentials of their azo reduction peaks are separated sufficiently. For both dyes, at intermediate pH values the azo peak is preceded by a complexed -copper reduction peak at a less negative potential, which aids the identification of the dyes. The use of pH 6 EDTA buffer removes the complexed-copper peak, as does the use of an acidic buffer (pH < 3). This unusual use of EDTA as a pH buffer facilitates the determination of mixtures of the dye and its hydrolysis product.
authors.affiliation: Chemistry Department, Loughborough University of Technology, Loughborough, Leicestershire, LE11 3TU, UK.
authors.forename: A G
authors.initials: AG
authors.lastname: Fogg
authors.forename: A
authors.initials: A
authors.lastname: Rahim
authors.forename: H M
authors.initials: HM
authors.lastname: Yusoff
authors.forename: R
authors.initials: R
authors.lastname: Ahmad