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The potentiometric response characteristics of a new copper(II) ion-selective PVC membrane electrode based on erythromycin ethyl succinate (EES) as ionophore were investigated. The electrode exhibited a Nernstian response to Cu2+ ions over the activity range of 1.5 × 10−2 to 2.0 × 10−6 mol L−1 with a limit of detection of 6.3 × 10−7 mol L−1. Stable potentials were obtained in the pH range of 5.5–6.5. The potentiometric selectivity coefficients were calculated by using fixed interference method and revealed no important interferences except for Ag+. This electrode was successfully applied as an indicator electrode in determination of copper ions in real water samples.
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Sadeghi et al. (2009) studied this question.
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