Probing trace Pb2+ using electrodeposited N,N′-(o-phenylene)-bis-benzenesulfonamide polymer as a novel selective ion capturing film

A novel film modified electrode for the determination of trace lead was developed in this work. The modified electrode was prepared by the electropolymerization of N,N′-(o-phenylene)-bis-benzenesulfonamide (PBSA) as the ion capturing reagent to create the functional film. The modified electrode shows a high selectivity towards Pb2+ over interfering cations, e.g. Cu2+, Cd2+, Co2+, Ni2+, Zn2+, Cr2+, and the calibration curve was linear in the concentration range of 2.0 × 10−9 to 1.0 × 10−7 M with correlation coefficient of 0.999. For 20 min accumulation, detection limit of 1.0 × 10−9 M was obtained at the signal to noise ratio of 3. Analytical availability of the modified electrode was demonstrated by the application for samples from pond water.