title: Voltammetric determination of hafnium with calconcarboxylic acid.
abstract: The interaction of Hf(IV) with calconcarboxylic acid (1-(2-hydroxy-4-sulfo-1-naphtylazo)-3-naphtolic acid) was investigated by cyclic voltammetry varying various factors (pH, ionic strength, contents of ethanol and scan rate). Optimal conditions of Hf(IV) determination in the presence of calconcarboxylic acid were found: acetic buffer solution pH 2.6, scan rate 0.5Vs(-1). The detection limit of Hf(IV) concentration was 2.46x10(-7)molL(-1). The influence of foreign ions on the Hf(IV) determination was studied. It was established that some metals like cadmium, nickel, zinc, copper and titanium could be determined with Hf(IV) simultaneously. The method of voltammetric determination of hafnium was tested on model solutions and used in the determination of Hf(IV) in terbium-base alloy.
authors.affiliation: Department of Analytical Chemistry, Faculty of Chemistry, Ivan Franko National University, Kyryla and Mefodia Str., 6, 79005 Lviv, Ukraine.
authors.forename: Halyna
authors.initials: H
authors.lastname: Levytska
authors.forename: Oksana
authors.initials: O
authors.lastname: Orshuliak