title: Extraction and spectrophotometric determination of titanium(IV) with alizarin and fluoride.
abstract: The characteristics of the mixed-ligand titanium(IV)-fluoride-alizarin complex, including the optimum conditions of formation and extraction into methyl isobutyl ketone, are described. A simple and sensitive procedure for spectrophotometric determination of titanium has been developed. At pH 9.5-10.3 titanium reacts with alizarin in the presence of fluoride to form a red-violet complex that is completely extractable into methyl isobutyl ketone, and has its absorption maximum at 513 nm. The molar absorptivity at 513 nm is 7.0 x 10(4)l.mole(-1).cm(-1). Beer's law is obeyed up to 22 mug of titanium in 30 ml of solution. The method has been used for the determination of titanium in an oxide mixture and aluminium alloy samples.
authors.affiliation: Department of Analytical Chemistry, Faculty of Chemistry, University of Sevilla, 41012 Sevilla, Spain.
authors.forename: R L
authors.initials: RL
authors.lastname: Nuñez
authors.forename: M C
authors.initials: MC
authors.lastname: Mochon
authors.forename: A G
authors.initials: AG
authors.lastname: Perez