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

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%.