Electrochemical sensing of Pb2+ ion in water by ion selective membrane electrode based on Polypyrrole titanium(IV)sulphosalicylo phosphate cation exchange nanocomposite

Polypyrrole titanium(IV)sulphosalicylophosphate (PPy-TSP) cation exchange nanocomposite was synthesized by in situ oxidative polymerization method. PPy-TSP membrane was prepared by solution casting method shows good results for ion-exchange capacity (IEC 0.91 meq/g), water content, porosity, thickness and swelling. Sorption behavior of five metal ions (Cu2+, Hg2+, Cd2+, Pb2+, Cr3+) by PPy-TSP was performed by distribution coefficient (Kd Values) and by DC electrical conductivity measurement using four probe conductivity meter. On the basis of high Kd Values and DC electrical conductivity for Pb2+ ion, a Pb2+ ion selective electrode was fabricated. The structure and morphology of the prepared membrane was ascertained by Fourier transform spectroscopy (FTIR), scanning electron microscopy (SEM), thermo gravimetric analysis (TGA) and elemental analysis. The electrode shows best results in concentration range from 1 × 10−1 M L−1 to 1 × 10−8 M L−1 of Pb2+ ion. The working pH range of the electrode is 3.0–7.0. The selectivity coefficients values for interfering ions also indicate good selectivity for Pb2+ over interfering anions.