Selectivity of voltammetric determination at an ion-exchanger modified electrode

An expression of the selectivity value for the voltammetric determination o f an ionic analyte in the presence of interfering component(s) at an electr ode chemically modified with an ion-exchanger has been developed and applie d to the analysis of a model metal-ion mixture. Using distribution coeffici ent values, the predicted selectivity value was calculated and compared wit h that obtained experimentally. The approach allows a choice of the ion-exc hange resin and experimental conditions for a given analytical task. (C) 20 00 Elsevier Science S.A. All rights reserved.