Analytical chemistry of nonlinear systems

Oxygen Production and Numerical Simulations of the Interphase Transport in the Modified Oscillating Briggs−Rauscher Reaction

“…This effect might accelerate the vaporization of I 2 molecules. Taking into consideration the measured value of the rate of O 2 transport between gas phase and solution in the BZ reaction, which is dependent on the stirring rate, and refs and , a value on the order ca. 10 -4 s -1 can be expected in our experimental setup.…”

Potential of the analyte pulse perturbation technique for the determination of polyphenols based on the Belousov–Zhabotinskii reaction

“…Tikhonova et al 4 in 1978 were the first authors to consider the quantitative use of oscillating reactions for analytical purposes. Since then, a number of analytical applications of chemical oscillators have been developed 5,6 that rely on the response of oscillating reactions to external perturbations. In such systems, the relationship of the oscillation attributes (period, amplitude, Lyapunov exponent, etc.)…”

“…The most widely known and studied oscillating chemical system is that based on the Belousov-Zhabotinskii (BZ) reaction, 5,6 which involves the oxidation of an organic substrate (usually malonic acid) by bromate ion in a sulfuric acid medium. This reaction is typically catalysed by cerium(IV) salts or by the ferroin complex; and regular chemical oscillations and chaotic regimes have been exploited for analytical purposes.…”

Critical ReviewApproaching the use of oscillating reactions for analytical monitoring

“…1,2 The dynamic regime of the chemical process involved in these methods is mainly monotonic; however, various types of dynamic regime have been explored in recent years in order to characterize non-linear chemical phenomena in the context of theoretical and experimental chemical kinetics. [3][4][5][6][7] These non-linear phenomena, known as 'oscillating chemical reactions', include regular oscillations, period doubling, quasi-periodicity and deterministic chaos, among others.…”

“…A detailed description of these and related aspects including limit cycles, bifurcation point, monostability, bistability, Fourier power spectra and Lyapounov exponents is beyond the scope of this review; interested readers are referred to pertinent books [3][4][5] and papers. 7,8 The first paper that considered the use of regular chemical oscillations for analytical monitoring was published by Tikhonova et al 13 in 1978. Since then, little additional research into the analytical potential of oscillating chemical reactions has been carried out.…”