Determination of ion-selective electrode characteristics by non-linear curve fitting.

摘要: A simple practical method of determining potentiometric selectivity coefficients ion-selective electrodes (ISEs) is described in which electrode characteristics (slope, and cell constant) can be determined by fitting the experimental data obtained using fixed interference (FI) to an appropriate model non-linear least-squares regression. The proposed implement practically, processing easily achieved through use optimisation add-on, Solver, bundled with Microsoft Excel. flexibility demonstrated modelling response a valinomycin potassium-selective Nikolskii-Eisenman equation recently alternative for cases where ionic charges on primary interfering ions are unequal.