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Vol. 122, Issue 11, November 2010, pp.28-35



Electrochemical Detection of Mn(II) and Cd(II) Mediated by Carbon Nanotubes and Carbon Nanotubes/Li+ Modified Glassy Carbon Electrode


*Muhammed M. Radhi, Wee T. Tan, Mohamad Z. AbRahman and Anuar Kassim

Department of Chemistry, Faculty of Science, University Putra Malaysia,

43400, UPM Serdang, Selangor, Malaysia

*Tel: +60-132916400, fax: +60-3-89432508

E-mail: mmrchm2007@yahoo.com



Received: 2 March 2010   /Accepted: 18 November 2010   /Published: 30 November 2010


Abstract: Glassy carbon electrode (GCE) was modified with carbon nanotubes (CNT) with and without a Li+ dopant by using a mechanical attachment method; CNT/Li+/GCE was used as two working electrodes, by doping CNT/GCE with Li+. The nano-structure of the electrodes showed individual voltammetrics of Mn2+ with two reduction peaks at +800 and +100 mV. Two reduction peaks for Cd2+ appeared at +600 V and -800 mV with one oxidation peak at -600 mV. The reduction current of Mn2+ and the redox current of Cd2+ on the CNT/Li+/GCE were largely influenced by a low concentration comparison with GCE and CNT/GCE. It showed that the detection of Mn2+ and Cd2+ by CNT/Li+/GCE in an aqueous solution of 0.1M KCL, with a relative standard deviation (RSD) of the electrode being very good CNT/Li+/GCE. The determination of efficiency for the best modified electrode was detected for Mn2+ and Cd2+ on CNT/Li+/GCE; it was also found to have a wide linear range and good repeatability with a relative standard deviation (RSD) of 1.9 % when this electrode was used and the limit of detection was found to be 10-4 to 10-3 mM of Mn2+ and 10-4 to 10-2 mM of Cd2+, while the range of detection was found to be 3x10-4 to 10-3 mM and 10-3 to 10 -2 mM when using the CNT/GCE for Mn2+and Cd2+, respectively, with an RSD of 3.3 % for Mn2+ and Cd2+.


Keywords: CNT/GCE, CNT/Li+/GCE, Mg(II), Cd(II), Electrocatalysis


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