Lead(II) Ion Selective Electrode with PVC Membrane Based on 5,5'-Dithiobis-(2-Nitrobenzoic Acid) as Membrane Carrier

Abstract

The characteristics of PVC membrane for lead(II) ion-selective electrode based on 5,5'-dithiobis-(2-nitrobenzoic acid) as carrier was studied. The electrode displays an excellent Nernstian response for Pb²⁺ over a wide concentration range (1.0 × 10^-5~1.0 × 10^-2 M). It has a rapid response time and can be used for at least 3 months without any divergence in potentials. The proposed electrode revealed good selectivities for Pb²⁺ over a wide variety of other metal ions in a pH range of 2.2- 7.0. It was used as an indicator electrode in potentiometric titration of sulfate ions with a lead ion solution.