Electrochemical study of glassy carbon electrode mediated by carbon nanotubes for detection of trace Mn(II)

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Carbon nanotubes CNT was modified on the surface of glassy carbon electrode (GCE) using mechanical method to prepare working electrode CNT/GCE and CNT/Li+/GCE were used in cyclic voltammetry analysis. The nanostructured electrodes showed individual voltammetric of Mn2+ two reduction peaks at +800 and +100 mV. The reduction current of Mn2+ on CNT/Li+/GCE was largely influenced by low concentration comparing with GCE and CNT/GCE. It was obtained the detection of Mn2+ by CNT/Li+/GCE in aqueous 0.1M KCl, 0.1M urea, seawater and blood samples as a supporting electrolyte, the relative standard deviation RSD of two electrodes is very good on CNT/Li+/GCE and CNT/GCE. The study to determine the efficiency of best electrode for Mn2+ detection, it was founded wide linear range and good repeatability relative standard deviation (RSD) of ±1.9% when used CNT/ Li+ /GCE and the limit of detection was found to be 10-4-10-3mM of Mn2+, while the limit of detection was determined 3x10-4-10-3mM when used CNT/GCE with RSD of ±3.3%.

CNT/GCE; CNT/Li+; Cyclic Voltammetry; Mangenes ion analysis; Electrocatalysis