title: Generation of pH-oscillations in closed chemical systems: method and applications.
abstract: All pH-oscillators reported to date function only under open (flow reactor) conditions. We describe an approach to generating pH-oscillations in a closed system by starting from an open system pH-oscillator, finding semibatch conditions under which it oscillates with an inflow of a single reactant to an otherwise closed reactor containing the remaining components, and replacing this inflow with a layer of silica gel impregnated with the key reactant. We present data showing the successful application of this technique to the BrO(3)(-)-Mn(2+)-SO(3)(2-), IO(3)(-)-Fe(CN)(6)(4-)-SO(3)(2-), and BrO(3)(-)-Fe(CN)(6)(4-)-SO(3)(2-) systems. In all three cases, sulfite ion is the species that is replenished via dissolution from the gel layer.
authors.affiliation: Department of Analytical Chemistry, L. Eötvös University, H-1518 Budapest 112, P.O. Box 32, Hungary.
authors.forename: Eszter
authors.initials: E
authors.lastname: Poros
authors.forename: Viktor
authors.initials: V
authors.lastname: Horváth
authors.forename: Krisztina
authors.initials: K
authors.lastname: Kurin-Csörgei
authors.forename: Irving R
authors.initials: IR
authors.lastname: Epstein
authors.forename: Miklós
authors.initials: M
authors.lastname: Orbán