SIMULTANEOUS DETERMINATION OF CATALYSTS BASED ON THE DIFFERENCES IN THE CHARACTERISTIC RATE SPECTRA OF CATALYTIC KINETICS

When a catalyst catalyses an indicator reaction, the reaction rate is a certain function of the concentration of each reactant and product. The plot of rate against the concentration of a reactant or product is called the characteristic rate spectrum (CRS) when the concentration of the catalyst is fixed. The CRS data are obtained from time-dependen t concentrations of the reactant or the product by using the method of Savitzky and Golay and the method of linear interpolation. Based on t he difference in CRS, a method for the simultaneous determination of c atalysts in a single kinetic run is proposed. The concentration of eac h catalyst is calculated by principal component regression. As an exam ple, Ru and Os were determined based on their catalytic effects on the indicator reaction between Ce(IV) and As(III). Factors that affect th e accuracy and precision were studied by using the method of cross-val idation.