THEORY AND EXPERIMENTAL-VERIFICATION OF CATALYTIC DETERMINATIONS BY CONTINUOUS ADDITION OF CATALYST TO A REFERENCE SOLUTION

A new method of catalytic determination is described. The method involves the comparison of the kinetic curve for the sample solution with the one for a reference solution to which a standard solution of catalyst is added at a constant rate, and in this way a so-called 'intersection time' may be measured. From the value of the mentioned 'intersection time', the concentration of catalyst may be obtained either by a direct calculation (pseudostoichiometric approach) or by a calibration plot (comparative approach). Theoretical equations are derived and experimental assessment is made by examining the behavior of the iodide-catalyzed Ce(IV)-As(III) reaction. Amperometric monitoring is used.