title: Spectrophotometric determination of cobalt(II) with 2-[di-(2-pyridyl)-methylidenehydrazino]quinoline.
abstract: A simple, rapid and selective procedure for spectrophotometric determination of cobalt has been developed. Cobalt(II) forms two water-soluble complexes with 2-[di-(2-pyridyl)methylidenehydrazino]quinoline, an orange-yellow complex (lambda(max) 510 nm) in the pH range 2-12 and a pink complex (lambda(max) 530 nm) in 0.1-6M perchloric acid medium. The molar absorptivities for the orange-yellow and pink complexes are 3.65 x 10(4) and 4.1 x 10(4) 1.mole(-1).cm(-1) and Beer's law is obeyed up to 1.84 and 2.0 ppm of cobalt(II) respectively. Cobalt(II) has also been determined in alloys.
authors.affiliation: Department of Chemistry, Delhi University, Delhi-110007, India.
authors.forename: R B
authors.initials: RB
authors.lastname: Singh
authors.forename: H L
authors.initials: HL
authors.lastname: Ray
authors.forename: B S
authors.initials: BS
authors.lastname: Garg
authors.forename: R P
authors.initials: RP
authors.lastname: Singh