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Vol. 146, No. 11, November 2012, pp. 191-202




Development of Electrochemical Sensors for the Detection of Mercury by CNT/Li+, C60/Li+ and Activated Carbon Modified Glassy Carbon Electrode in Blood Medium

*1Muhammed M. Radhi, 1 Dawood S. Dawood, 2 Nawfal K. Al-Damlooji and 3 Tan W. Tee

1 Department of Radiological Techniques, College of Health and Medical Technology, Baghdad, Iraq

2 Department of physiotherapy Techniques, College of Health and Medical Technology, Baghdad, Iraq

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

43400 Serdang, Selangor, Malaysia

* Tel.: +964-7901302475

E-mail: mmradhi@yahoo.com


Received: 30 June 2012   /Accepted: 23 November 2012   /Published: 30 November 2012

Digital Sensors and Sensor Sysstems


Abstract: An electrochemical investigation of mercury species has been carried out by using cyclic voltammetry (CV) at different modified electrodes. The doping of the Li+ ion onto the modified glassy carbon electrode (GCE) with carbon nanotubes CNT and C60 was carried out to 10 potential cycling in the presence of 0.1 M LiOH. The modified CNT/Li+/GCE, C60/Li+/GCE and modified activated carbon (AC) on GCE as AC/GCE were used as working electrodes and applied for the detection of Hg(II) ion in blood medium using cyclic voltammetry (CV) technique. Electrodes response was obtained for the oxidation peak of 0.1 mM of Hg(II) ion in 0.1 M KCl at lithium doped modified CNT/GCE, C60/GCE, and only AC/GCE. A well defined oxidation peak appeared at +0.8 V vs. Ag/AgCl with a current enhancement and peak potential shift toward higher potential due to nano materials (CNT and C60) and presence of Lithium doped comparison with CNT/GCE, C60/GCE, and only AC/GCE. Besides that, the presence of CNT with Lithium doped in blood media caused an increase of the oxidation peak of Hg(II) ion (current enhancement) by about three times compared to use of other modified electrodes. A linear relationship (R2=0.986, Y=26.60X+12.10 and RSD= 2.4 %) was observed for the plot of current (μA) versus concentration range of 310-3- 610-2 M of Mercury in blood media using CNT and Lithium doped modified GCE. Based on the background noise of 50 data points, adjacent to the oxidation peak of Hg(II), and 3σ/slope, a detection limit of 3 10-3 M was determined. So it can be said that these modified electrodes could be used as good sensors in CV for the detection of traces of mercury in blood medium.


Keywords: Sensors, Blood medium, Hg(II), CNT/Li+/GCE, C60/Li+/GCE, AC/GCE



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