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Influence of oxygen on the Belousov—Zhabotinskii oscillating reaction. II. Liberation of gaseous reaction products and concentration oscillations of oxygen

I. Tkáč and Ľ. Treindl

Department of Physical Chemistry, Faculty of Natural Sciences, Komenský University, CS-842 15 Bratislava


Abstract: The average rate of malonic acid oxidation as a function of flow and method of oxygen bubbling may increase as well as decrease. At a low efficiency of bubbling, the curves describing the evolution of CO2 in N2 and O2 twice intersect each other. At a high efficiency of bubbling, the amount of C02 evolved in O2 is considerably greater than in N2 in spite of the fact that the consumption of bromate is decreased. The participation of O2 in oxidation of malonic acid can exceed 70 %. During the induction period the liberation of bromine in the presence of O2 is retarded, but its overall liberated quantity is increased. For one oscillation, more bromine is released in O2 though the average rates of its liberation in the course of oscillations in N2 and O2 are comparable. If the solution is bubbled through with O2 , two types of concentra­ tion oscillations of dissolved O2 may arise, either in the region of low or high concentration. The second type is conditioned by the effective removal of bromine from the reaction system.

Full paper in Portable Document Format: 392a161.pdf


Chemical Papers 39 (2) 161–174 (1985)

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