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Magomedbekov U. G.
Auto-Oscillation
in the System Ascorbic Acid-Dihydroascorbic Acid in the Presence of
Hydroxygenated Complexes of Iron (II)
Abstract
The
results of investigation of chemical oscillation processes realized during
oxidation of ascorbic acid in the presence of oxygenating complexes of iron
(II) in the homogeneous phase are given. The limits of reagent and catalyzator
concentrations, pH and temperature for observations of chemical oscillations
are determined. On the ground of Fourier - transformations and reconstructions
of dynamics according to the temporary sequence of data the frequencies of
oscillations along with the measurement of phase space and attractor are
defined.The possible mechanism of passing of processes is offered and the
mathematical model describing kinetics is made up. The thermodynamic analysis
of process is done, on the ground of which the reasons for manifesting chemical
instabilities are revealed. The quantitative analysis of the system of
differential equations is done, describing the kinetics of reasons and their
numerical solution is received. The character of the stationary state and
possible bifurcation are defined. It was revealed that mathematical model
semiquantitatively describes the proceeding processes in the system.
Copyright (C) Chemistry Dept., Moscow State University, 2002
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