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Fabrication of Pb(II) Selective Polymeric Membrane Electrode Based on 2,2��?[Propane-1,3-Diylbis(Oxy)]Dibenzaldehyde as an Ionophore.

Karamjeet Kaur and Jatinder Singh Aulakh

2,2'-[propane-1,3-diylbis(oxy)]dibenzaldehyde has been explored as an ionophore and fabricated in a polyvinylchloride (PVC)-based membrane. The electrode shows excellent potentiometric response characteristics and displays a linear log [Pb(II)] versus emf response over a wide concentration range of 1.2 × 10-7 M to 1.0 × 10-1 M with detection limit 3.3 × 10-8 M and having nernstian slope of 29.06 mV/decade. Potential response remains almost unchanged at pH range of 3.0-8.0. The electrode shows fast response time of <10 s and a lifetime of four months. It shows good selectivity for Pb(II) ions over the other cations. The complexation 2,2'-[propane-1,3- diylbis(oxy)]dibenzaldehyde and Pb(II) cation was studied spectrophotometrically in 1:1 DMF:H2 O mixed solvents. Spectra shows the strong interaction between Ionophore and Pb(II) ion. The electrode can also be used as an indicator electrode in potentiometric titration of Pb(II) ions with standard chromate solution and its determination in real samples.