Abstract
A PVC membrane electrode for lead ions based on phenyl disulfide as the membrane carrier was developed. The electrode exhibits a good Nernstian slope of 29.3 ± 0.7 mV/decade and a linear range of 2.0 × 10-6 - 1.0 × 10-2 M for Pb(NO3)2. The limit of detection is 1.2 × 10-6 M. It has a response time of 45 s and can be used for at least fifty days without any divergence in potential. The proposed membrane sensor revealed high selectivity for Pb2+ over a wide variety of other metal ions and could be used in the pH range of 3.5 - 6.3. The electrode was used as an indicator electrode in potentiometric titration of lead ions.
