A carbon paste electrode impregnated with Cd 2+ imprinted polymer as a new and high selective electrochemical sensor for determination of ultra-trace Cd 2+ in water samples

Abstract

A carbon paste electrode (CP) impregnated with Cd 2+ ion imprinted polymer (IIP) was prepared and used for differential pulse voltammetry determination of Cd 2+ in real samples. The IIP was prepared by using vinyl pyridine and quinaldic acid as functional monomer and complexing agent, respectively. Voltammetric response of the IIP–CP was considerably higher than that of the electrode modified with the non-imprinted polymer (NIP–CP), indicating properly functioning of the recognition sites of the IIP. Compared to the previously developed cadmium sensors, this sensor showed considerably better resistance against potential interfering agents such as Cu 2+, Hg 2+ and Pb 2+. This sensor showed linear range of 1.0 × 10 −9–5.0 × 10 −7 M and detection limit of 5.2 × 10 −10 M ( S/ N = 3).