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Abstract
The experimental behavior of the ferroin-catalyzed Belousov-Zhabotinskii (BZ)-type reaction with 3,4-dihydroxybenzoic acid as organic substrate has been investigated. It was found that the system displays two types of temporal oscillations depending on the initial concentration of bromide. When [Br −] is very high, damped high-frequency oscillations appear. When [Br −] is very low, low-frequency oscillations of the normal type are obtained. At moderate concentrations of bromide, both high-frequency and low-frequency oscillations can be monitored with a bromide ion selective electrode. The mechanism of the dual-frequency oscillation is discussed.
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