Simultaneous determination of lead(II) and cadmium(II) at a glassy carbon electrode modified with GO@Fe3O4@benzothiazole-2-carboxaldehyde using square wave anodic stripping voltammetry

Magnetic graphene oxide (GO@Fe3O4) modified with benzothiazole-2-carboxaldehyde (2-CBT) was used for the first time for the simultaneous determination of trace amounts of lead and cadmium in the aqueous solution by means of square wave anodic stripping voltammetry (SWASV). The novel nanocomposite (GO@Fe3O4@2-CBT) was evaluated using Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectrometry (EDX), and thermogravimetric analysis (TGA). The effects of several factors such as pH, deposition potential, deposition time, type of the supporting electrolyte, and potentially interfering ions were investigated. Under the optimum conditions, the limits of detection (LODs) calculated using 3(Sb) blank/m and were 0.03 ng mL(-1) and 0.02 ng mL(-1) for Cd(II) and Pb(II) respectively. As a selective and sensitive sensor, the modified electrode was applied in order to determine Pb(II) and Cd(II) ions in different water samples with very satisfactory results. (C) 2017 Elsevier B.V. All rights reserved.