Self-organization In The Chemical Reactions And Analytical Applications Of Oscillating Chemical Reactions In The Organic Compounds

In recent years,more and more self-organized phenomenon which was obseverd in non-linear system, in particular, have become of great interest across of wide range of scientific research. Oscillating chemical reactions exhibit exotic behavior and unusual mechanisms. Consequently, they have been considered as a useful tool for the determination of trace amounts of chemical compounds This work develops new methods using oscillating chemical reaction for quantitative analytical determinations of resorcinol, and ephedrine, the accuracy and selectivity of these methods are well-pleasing. The main content consists of three partsPart I Self-organization in the Chemical Reactions and Analytical Applications of Oscillating Chemical Reactions in the Organic CompoundsThis literature review provides a simple introduction to the phenomenon of "self-orgnization in chemical reaction" -oscillating chemical reaction., and provides some basic thermodynamic theory related. Mechanisms of some chemical oscillators that were used in analytical determinations are reported in details, especially B-Z chemical oscillation. The research progress in analytical applications from 1978 to 2003 is discussed systematically through representative examplesPart II Kinetic Determimation of Trace Amount of Resorcinol by B-Z Oscillating Chemical ReactionAn analytical method for the determination of trace amount of resorcinol is establishd by studying its pertubation on B-Z oscillating reaction. The best reaction condition and the reactant's concentrations are reported. The amplitude decrease of the poteniometric oscillation is linearly proportional to the concentration of resorcinol in the range of 6.5×10-7 mol·L-1 - 1.0×10*5 mol·L-1, with the correlation coefficien of 0.9989. In the range of 1.5×10-5 mol·L-1 - 6.5 × 10-4 mol·L-1, the decrease in amplitudeversus the concentrations of resorcinol fits a second-order equation, and the correlation coefficient is 0.9949. Detection limite is 6.0×10-7 mol·L-1. The method is used to determine resorcinol in waster water, a satisfactory results are achieude. The mechanism of the pertubation is discussed.Part III Determination of Ephedrine by an Cu(II) Catalized Oscillating Chemical ReactionA new analytical method for the determination by the perturbation caused by different amounts of ephedrine on the oscillating chemical system, involving the Cu( II )-catalysed reaction between hydrogen peroxide and sodium thiocyanate in closed system, is proposed. The method relies on the linear relationship between the changes in the oscillating amplitude and the logarthm of concentration of ephedrine. The calibration curve is linear over the range from 1.06×10-3 mol·L*1 - 2.5×10-6 mol·L-1, and the correlation coefficient is 0.9954. Detection limite is 2.05×10-6 mol·L-1. Some aspects of the interaction of ephedrine with the oscillating chemical system are also discussed.