Voltammetric Detection of Copper Ions on a Gold Electrode Modified with a N-methyl-2-naphthyl-cyclam film |
| |
| Authors: | Wahid Ben Mefteh Yves Chevalier Camelia Bala Nicole Jaffrezic-Renault |
| |
| Institution: | 1. Institute of Analytical Sciences, UMR CNRS 5280, University of Lyon, Villeurbanne, France;2. Department of Analytical Chemistry, University of Bucharest, Bucharest, Romania;3. Laboratory of Automatics and of Process Engineering, UMR CNRS 5007, University of Lyon, Villeurbanne, France;4. Department of Analytical Chemistry, University of Bucharest, Bucharest, Romania |
| |
| Abstract: | A voltammetric sensor based on a methyl-naphthyl cyclam (1,4,8,11-tetraazacyclotetradecane) film deposited through dip coating on gold electrodes allowed the sensitive detection of copper (II). The obtained film was characterized in terms of the composition and morphology using Fourier transform infrared (FTIR) spectroscopy and atomic force microscopy. In the presence of divalent metallic ions (copper and nickel) and trivalent metallic ions (iron), at pH 7 and 7.7, the current density of the ionic oxidation peak maximum was determined using square wave voltammetry. The relative variation of this current density varies linearly with the base-ten logarithm of the ion concentration. From this calibration curve, a detection limit of 7?×?10?12?M was obtained for copper (II) at pH 7. At this pH value, the sensitivity of detection of copper (II) was 2.5 times higher than for nickel (II) and 5.8 times higher than for iron (III). The methyl-naphthyl cyclam film-modified gold sensor was validated for the detection of copper in spiked urine samples. |
| |
| Keywords: | Atomic force microscopy copper ions cyclam film Fourier transform infrared spectroscopy square wave voltammetry |
|
|
