Amperometric Detection of Nitrite on Glassy Carbon Electrode Modified with Cobalt Nitroprusside

 R.E. Sabzi*

 

Department of Chemistry, Faculty of Science, Urmia University, Urmia-Iran

 Received 20 October 2006; accepted 8 March 2007

 

Abstract

The glassy carbon electrode (GCE) modified with cobalt nitroprusside (CoNP) was prepared by electrochemical method. The CoNP modified electrode (ME) prepared electrochemically on a GCE in two-step. The electrochemical behavior of the modified electrode was studied by cyclic voltammetric technique. The cyclic voltammogram of CoNP showed a redox couple with formal potential [E⁰ =(E_pa+E_pc)/2] of 500 mV vs. SCE. The electrocatalytic oxidation of nitrite was studied on the CoNP modified glassy carbon electrode. The CoNP films on the glassy carbon electrode show an excellent electrocatalytic activity toward the oxidation of nitrite in 0.5 mol L^-1 KNO₃. Hydrodynamic amperometry was used to the detection of nitrite with CoNP. The linear detection limit of the CoNP elctrode for NO₂^- was from 20×10^-6 to 220×10^-4 mol L^-1 and the detection limit was 10×10^-6 mol L^-1 (S/N=3).

 

Keywords: amperometric detection, cobalt nitroprusside, nitrite oxidation, modified electrode, modified glassy carbon electrode.

 

 

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*Corresponding author. E-mail address: rezasabzi@yahoo.com