Abstract
A new pH oscillator has been discovered involving the system of NaClO2, Na2SO3, and H2SO4 in a continuous-flow stirred tank reactor (CSTR). While ClO2- serves as an oxidant in numerous systems exhibiting nonlinear dynamical behavior, this is the first reported chlorite-based pH oscillator. Large-amplitude oscillations in pH and potential of a platinum electrode were observed over a rather narrow concentration range. Complex dynamical behavior also was observed, including aperiodic oscillations, bistability between steady states, bistability between steady state and oscillatory state, bursting, a possible third steady state, and damped oscillations in batch. Autocatalytic oxidation of HSO3- by ClO2- is a major source of positive feedback in H+. A fast Cl+-transfer reaction between HOCl and SO32- is an important source of negative feedback. Oscillations were also obtained in the presence of Na2CO3, with the dehydration reaction of H2CO3 providing additional negative feedback. Models are proposed to account ...
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