Lead(II) Selective PVC Membrane Electrode Based on Zinc Complex of Salicylaldehyde Semicarbazone as an Ionophore ZSSC

A polymeric membrane based lead selective electrode was developed by using zinccomplex of salicylaldehyde semicarbazone. the best performance was recorded with amembrane composition of pvc: dbp: ionophore: natpb as 33: 58: 4: 5 (w/w %). thenernstian slope calculated from the calibration curve for pb2+ sensor was 29.2 mv/ decade.the detection limit of the sensor was 3.10×10-9 m, in the linear concentration range of 1.0×10-2-1.0×10-8 m. it was relatively fast response time ( < 10s for concentration ?1.0×10-3 and < 15sfor concentration of ?1.0×10-6 m) and can be used for 9 months without any considerabledivergence in potentials. the proposed sensor exhibit relatively good selectivity and highsensitivity for lead(ii) as other mono, di and trivalent cations and can be used in a ph range of2.0-10.5. it was used successfully as an indicator electrode in potentiometer titrations and alsodetermines the concentration of lead in water of yamuna river at different sites of delhi.