Lead(II)-Selective Electrode Based on Dibenzodiaza-15-crown-4

Abstract

A PVC-based membrane of dibenzodiaza-15-crown-4 reveals a Nernstian potentiometric response for Pb²⁺ over a wide linear range (5.0 × 10^–6–1.0 × 10^–2 mol/L) with detection limit of 3.5 × 10^–6 mole/L. It has a response time of about 15 s and can be used for at least 3 months without any divergence. The proposed membrane sensor revealed good selectivity for Pb²⁺ over a wide variety of alkali, alkaline earth and transition metal ions. The electrode was used as an indicator electrode in potentiometric titration of lead.