title: Flow-injection photometric determination of manganese(II) based on its catalysis of the periodate oxidation of N,N'-bis(2-hydroxy-3-sulfopropyl)tolidine.
abstract: A novel flow-injection spectrophotometric method has been developed for the determination of manganese(II) at sub-nanogram/ml levels. The method is based on its catalytic effect on the oxidation of N,N'-bis(2-hydroxy-3-sulfopropyl)tolidine (HSPT) by periodate. The catalytic effect of manganese(II) was enhanced by the presence of 2,2'-bipyridine as an activator. By monitoring the change in absorbance of the oxidation product of HSPT at 670nm, manganese(II) ranging 0.02-3.0ngml(-1) could be determined with the relative standard deviations of less than 2%. The interfering ions were effectively suppressed by the addition of 2,2'-iminodiethanol and citric acid. The proposed method is directly applicable to the determination of manganese in lake and river water samples.
authors.affiliation: Department of Regional Environment, Faculty of Regional Sciences, Tottori University, Koyama-cho, Tottori 680-8551, Japan.
authors.forename: Shigenori
authors.initials: S
authors.lastname: Nakano
authors.forename: Yuko
authors.initials: Y
authors.lastname: Matumoto
authors.forename: Masahiro
authors.initials: M
authors.lastname: Yoshii