Probing trace Pb(2+) 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 Pb(2+) over interfering cations, e.g. Cu(2+), Cd(2+), Co(2+), Ni(2+), Zn(2+), Cr(2+), and the calibration curve was linear in the concentration range of 2.0x10(-9) to 1.0x10(-7)M with correlation coefficient of 0.999. For 20min accumulation, detection limit of 1.0x10(-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.