Author/Authors :
Chandra، Sulekh نويسنده Department of Chemistry, Zakir Husain College,University of Delhi, J.L.N.Marg, New Delhi-110002, India , , Sharma، Kusum نويسنده Department of Applied chemistry, MAIT, (G G S I P University) Sec-22 Rohini New Delhi, India , , Kumar، Adarsh نويسنده ,
Abstract :
A polymeric membrane based lead selective electrode was developed by using zinc
complex of salicylaldehyde semicarbazone. The best performance was recorded with a
membrane composition of PVC: DBP: Ionophore: NaTPB as 33: 58: 4: 5 (w/w %). The
Nernstian 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 < 15s
for concentration of ?1.0×10-6 M) and can be used for 9 months without any considerable
divergence in potentials. The proposed sensor exhibit relatively good selectivity and high
sensitivity for lead(II) as other mono, di and trivalent cations and can be used in a pH range of
2.0-10.5. It was used successfully as an indicator electrode in potentiometer titrations and also
determines the concentration of lead in water of Yamuna River at different sites of Delhi.
