Selectivity of voltammetric determination at an ion-exchanger modified electrode

An expression of the selectivity value for the voltammetric determination of an ionic analyte in the presence of interfering component(s) at an electrode chemically modified with an ion-exchanger has been developed and applied to the analysis of a model metal-ion mixture. Using distribution coefficient values, the predicted selectivity value was calculated and compared with that obtained experimentally. The approach allows a choice of the ion-exchange resin and experimental conditions for a given analytical task.