LAUSR

Abstract In this paper, a novel & highly sensitive copper sensor based on a dopamine modified carbon ceramic electrode (CCE) is presented. By immersing the CCE in aqueous solution of dopamine (0.2 M), after a short period of time, a thin film of dopamine was rapidly formed on the surface of the electrode due to its strong adsorption properties. The prepared modified carbon ceramic electrode was characterized by scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FTIR). Then, the effective parameters on sensor response were optimized and anodic stripping voltammetry (ASV) was used for quantitative determination of copper. The calibration plot was linear over the copper concentration range of 0.1–250 µg L−1. The limit of detection (LOD) was found 0.03 µg L−1 of Cu(II), and for seven successive determinations of 10 and 140 µg L−1 Cu(II), the relative standard deviations were obtained 1.5% and 1.1%, respectively. The dopamine modified carbon ceramic electrode (CCE/DOP), prepared in this study, showed high selectivity and sensitivity via formation of a Cu-dopamine complex and applied for the determination of Cu(II) in real samples with good results.