0872-1904 0872-1904 S0872-19042007000300008 Iran 00 00 2007 00 00 2007 25 3 383 390

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 =(Epa+Epc)/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.

]]>  

 

Texto disponível em PDF

Full text only in PDF format

 

References

1.C. Andrade, J.H. Swinehart, Inorg. Chemistry 11 (1972) 648.         [ Links ]

2.M.D. Jonhnson, R.G. Wilkins, Inorg. Chem. 23 (1984) 231.

3.E. Reguera, A. Dago, A. Gomez, J.F. Bertran, Polyhedron 15 (1996) 3139.

4.A. Gomez, E. Reguera, L.M.D. Granswick, Polyhedron 20 (2001) 165.

]]> 5.H.M. Carapuça, O.M.S. Filipe, J.E.J. Simão, A.G. Fogg, J. Electroanal. Chem. 480 ( 2000) 84.

6.H.M. Carapuça, J.E.J. Simão, A.G. Fogg, J. Electroanal. Chem. 455 (1998) 93.

7.Z. Gao, Y. Zhang, G. Wang, Anal. Sci. 14 (1998) 1053.

8.M.H. Pournaghi-Azar, R. Sabzi, J. Electroanal. Chem. 543 (2003) 115.

9.M.H. Pournaghi-Azar, R. Sabzi, Electroanalysis 16 (2004) 860.

10.R.E. Sabzi, M.H. Pournaghi-Azar, Anal. Sci. 21 (2005) 689.

11.R.E. Sabzi, J. Braz, Chem. Soc. 16 (2005) 1262.

12.Z. Gao, A. Ivaska, Anal. Chim. Acta 259 (1992) 211.

13.Z. Gao, J. Electroanal. Chem. 358 (1993) 161.

14.D.R. do Carmo, R.M.da Silva, N.R. Stradiotto, Port. Electrochim. Acta 23 (2005) 457.

]]> 15.D.R. do Carmo, R.M da Silva, N.R. Stradiotto, Port. Electrochim. Acta 22 (2004) 71.

16.M.H. Pournaghi-Azar, H. Razmi-Nerbin, Electroanalysis 12 (2000) 209.

17.M.H. Pournaghi-Azar, H. Razmi-Nerbin, J. Electroanal. Chem. 488 (2000) 17.

18.H. Razmi-Nerbin, M.H. Pournaghi-Azar, J. Solid State Electrochem. 6 (2002) 126.

19.M.H. Pournaghi-Azar, M. Hydarpour, H. Dastangoo, Anal. Chim. Acta 497 (2003) 133.

20.H. Razmi, M. Agazadeh, B. Habibi-A, J. Electroanal. Chem. 547 (2003) 25.

21.H. Razmi, M. Hossaini Sadr, B. Habibi-A, J. Electroanal. Chem. 574 (2005) 207.

22.M.H. Pournaghi-Azar, H. Dastangoo, Electrochim. Acta 48 (2003) 1797.

23.M.H. Pournaghi-Azar, H. Dastangoo, J. Electroanal. Chem. 567 (2004) 211.

24.M.H. Pournaghi-Azar, H. Nahalparvari, J. Electroanal. Chem. 583 (2005) 307.

]]> 25.W. Lijinsky, S.S. Epstein, Nature (London) 225 (1970) 21.

26.I.A. Wolf, A.E. Wasserman, Science 177 (1972) 15.

27.W. Frenzel, J. Schulz-Brussel, B. Zinvirt, Talanta 64 (2004) 278.

28.A. Aydin, O. Ercan, S. Tasciog،lu, Talanta 66 (2005) 1181.

29.C.A. Caro, F. Bedioui, J.H. Zagal, Electrochim. Acta 47 (2002) 1489.

30.J.A. Harrison, Z.A. Khan, J. Electroanal. Chem. 28 (1970) 153.

 

 

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

 

]]> 1972 11 648