Schiff base modified Pt electrode as sensor for detecting Al(III) and Pb(II)

Abstract

A platinum electrode with its surface modified with the condensation product of <i>p</i>-phenylenediamine and acetylferrocene (PPDA-AcFc) has been fabricated by cyclic voltammetry. The square wave voltammogram of the modified electrode, PPDA-AcFc/Pt, in aqueous medium gradually shifts by 0.440 V and 0.090 V in the positive direction on interaction with Al³⁺ and Pb²⁺ respectively. Electrochemical impedance spectroscopy shows the charge transfer resistance value of PPDA-AcFc/Pt electrode increases in the case of Al³⁺ while it decreases in the case of Pb²⁺. The linear range of detection is 0-12 µ<i>M</i> and 0-6 µ<i>M</i> for Al³⁺ and Pb²⁺ respectively.