ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

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)