title: Square-wave voltammetry of the o-catechol-Ge(IV) catalytic system after adsorptive preconcentration at a hanging mercury drop electrode.
abstract: Square-wave (SW) voltammetry in connection with a hanging mercury drop electrode has been applied for studying the reduction of Ge(IV) catalyzed by o-catechol after adsorptive preconcentration. Acetate buffer solutions with low and high analytical concentrations of o-catechol [with respect to that of Ge(IV)] have been used. Dependences of SW catalytic peaks on accumulation conditions have been attributed to the formation of the catalytic complexes via a direct-adsorption mechanism. The nature of the electrocatalytic process (involving an apparently quasi-reversible electrode reaction with an adsorbed reactant and a diffusing product) allows us to explain complex dependences of catalytic peaks on SW-parameters. Adequate conditions for determination of o-catechol and Ge(IV) by means of SW catalytic adsorptive voltammetry have been established.
authors.affiliation: Departamento de Quimica-Fisica y Analitica, Universidad de Oviedo, E-33071 Oviedo, Asturias, Spain.
authors.forename: J L
authors.initials: JL
authors.lastname: Muñiz Alvarez
authors.forename: J A
authors.initials: JA
authors.lastname: García Calzón
authors.forename: J M
authors.initials: JM
authors.lastname: López Fonseca