Analytical Sciences

Bis(2-hydroxyacetophenone)ethylenediimine as a Neutral Carrier in a Coated-Wire Membrane Electrode for Lead(II)

Mohammad MAZLOUM ARDAKANI,* Pouran POURHAKAK,** and Masoud SALAVATI-NIASARI**

*Chemistry Department, Yazd University, Yazd, Iran
**Chemistry Department, Kashan University, Kashan, Iran

A coated-wire ion-selective electrode (CWISE), based on a Schiff base as a neutral carrier, was successfully developed for the detection of Pb(II) in aqueous solution. CWISE exhibited a linear response with a Nernstian slope of 29.4 ± 0.5 mV/decade within the concentration range of 1.0 × 10^-5 - 1.0 × 10^-1 M lead ion. CWISE has shown detection limits of 5.0 × 10^-6 M. The electrode exhibited good selectivity over a number of alkali, alkaline earth, transition and heavy metal ions. This sensor yielded a steady potential within 10 to 20 s at a linear dynamic range. The electrode was suitable for use in aqueous solutions in a pH range of 2.0 to 5.0. Applications of this electrode for the determination of lead in real samples and as indicator electrode for potentiometric titration of Pb²⁺ ion using K₂CrO₄ are reported.

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