Journal
PORTUGALIAE ELECTROCHIMICA ACTA
Volume 25, Issue 3, Pages 383-390Publisher
SOCIEDADE PORTUGUESA ELECTROQUIMICA
DOI: 10.4152/pea.200703383
Keywords
amperometric detection; cobalt nitroprusside; nitrite oxidation; modified electrode; modified glassy carbon electrode
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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 [E-0 =(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 20x10(-6) to 220x10(-4) mol L-1 and the detection limit was 10x10(-6) mol L-1 (S/N=3).
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