title: Synthesis of 2-(3,5-dichloro-2-pyridylazo)-5-dimethylaminophenol and its application to the spectrophotometric determination of cobalt.
abstract: 2-(3,5-Dichloro-2-pyridylazo)-5-dimethylaminophenol (3,5-diCl-DMPAP) has been synthesized and its analytical application investigated. It reacts with cobalt in aqueous solution at pH 2.2-6.0 and room temperature to form a water-soluble ML(2) complex with absorption maximum at 590 nm, and molar absorptivity 8.4 x 10(4) l.mole(-1).cm(-1). Interference from other transition metals can be eliminated by their solvent extraction with 8-hydroxyquinoline. The method has been successfully applied to determination of cobalt in mild steels.
authors.affiliation: Department of Chemistry, Faculty of Science, Kumamoto University, Kumamoto 860, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Nakamura
authors.forename: Y
authors.initials: Y
authors.lastname: Sakanashi
authors.forename: H
authors.initials: H
authors.lastname: Chikushi
authors.forename: F
authors.initials: F
authors.lastname: Kai
authors.forename: S
authors.initials: S
authors.lastname: Sato
authors.forename: T
authors.initials: T
authors.lastname: Sato
authors.forename: S
authors.initials: S
authors.lastname: Uchikawa