title: Dissociation kinetic analysis of Ce(III) complex with Quin2 by microchip capillary electrophoretic reactor.
abstract: Dissociation kinetic analysis of a complex of Ce(3+) with a polyaminocarboxylic ligand, 8-amino-2-[(2-amino-5-methylphenoxyl)methyl]-6-methoxyquinoline-N,N,N',N',-tetraacetic acid (Quin2), was studied by microchip capillary electrophoretic reactor. Dissociation rate constants, k(d), of Ce(3+)-Quin2 complex in alkaline conditions at pH 8.3 - 9.8 were determined. The linear relationship of k(d) with the concentration of hydroxide ion indicates the existence of a hydroxide ion-assisted path in the dissociation reaction of Ce(3+)-Quin2 complex in alkaline conditions. The solvolytic dissociation rate constant, and the hydroxide ion-assisted dissociation rate constant of Ce(3+)-Quin2 complex were determined to be 1.55 × 10(-3) and 3.24 × 10(2) s(-1) in the analysis of the dependence of k(d) with the concentration of hydroxide ion, respectively.
authors.affiliation: Graduate School of Environmental Studies, Tohoku University, 20 Aoba, Aramaki, Aoba, Sendai 980-8579, Japan.
authors.forename: Kei-ichirou
authors.initials: K
authors.lastname: Ohtsuka
authors.forename: Nobuhiko
authors.initials: N
authors.lastname: Iki
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Hoshino
authors.forename: Toru
authors.initials: T
authors.lastname: Takahashi