Electrochemical determination of benzoic acid using CuGeO₃ nanowire modified glassy carbon electrode

Abstract

Copper germanate (CuGeO3) nanowires are applied as the electrochemical modified materials for the electrochemical determination of benzoic acid (BA) in neutral solution. The electrochemical responses of BA at the CuGeO3 nanowire modified glassy carbon electrode (GCE) show two pairs of electrochemical cyclic voltammogram peaks (cvp) which originate from the nanowires. The linear range is 0.01–2 mM and detection limit is 6.3 µM for cvp1 at a signal-to-noise ratio of 3. The linear range and detection limit, respectively, are 0.001–2 mM and 0.91 µM for cvp2. Scan rate plays an important role on the electrochemical behavior of BA at the CuGeO3 nanowire modified GCE. There is a linear correlation between the anodic current and scan rate in the range of 25–200 mV s−1. The CuGeO3 nanowire modified GCE exhibits good stability and reproducibility. The good analytical performance indicates that the CuGeO3 nanowires have a potential application for the determination of BA.