Admissions Open
Admissions Open
Potentiometric lead sensor was prepared by using 2[(4-chloro-phenylimino)-methyl]-phenol as as an ionophore and epoxy resin as a binding material. A membrane with 60% Schiff base exhibited the best performance in the concentration range 1.0X 10−6 to 1.0X 10−1 mol/dm3 with Super Nernstian slope of 43±0.1 mV/decade. The electrode shows a fast response time (< 10 sec) and could be used for a period of 4 months with a good reproducibility. The proposed electrode reveals very high selectivity for Pb+2 in the presence of transition metal ions such as Mg+2, Mn+2, Co+2, Cu+2, Ni+2, Cr+2 and Cd+2 etc. at concentrations 1.0×10−3 M and 1.0×10−4 M. Effect of internal solution concentration was also studied. The proposed sensor can be used in the pH range of 2.50 – 9.0. The practical utility of the sensors has been shown by using it as an indicator electrode in the potentiometric titration with EDTA. Electrode was employed for direct determination of lead in rocks with a good agreement with the results obtained by Atomic Absorption Spectroscopy