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Source of the bromide ions in the oscillation reaction of the Belousov-Zhabotinskii type with D-glucose

P. Ševčík and O. Guráňová

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


Abstract: The redox reaction between the bromate ions and D-glucose is autocatalytic in homogeneous medium. Provided the bubbling with nitrogen is sufficient, it is a first-order reaction with respect to both reactants and k=2.02 x 10-3 dm3 rnol-1 s-1 in 1 M-H2S04 at 25 °C. For an aqueous solu­tion of bromine and D-glucose the oxidizing particle is the bromine molecule and the two-electron reaction pathway through HOBr is relatively unimpor­tant for production of the Br- ions. The reaction of Br2 with D-glucose is light-sensitive and in dark it is a first-order reaction with respect to both reactants while it holds к = 5.57 x 10-4 dm3 mol-1 s" 1 in 1 M-H2S04 at 25 °C. There are indications that the bromine atoms are precursor of the bromide ions in the investigated system.

Full paper in Portable Document Format: 444a467.pdf


Chemical Papers 44 (4) 467–475 (1990)

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