Catalytic Voltammetric Determination of Vanadium in Crude Oil at Carbon Nanotube Paste Electrode

Abstract:

A catalytic voltammetric method for the determination of vanadium(V) at a multi-wall carbon nanotube paste electrode (MWCNT-PE) in a 4-(2-pyridylazo)-resorcinol(PAR)-bromate system is proposed. The voltammetric response of V(V)-PAR complex at MWCNT-PE was significantly enhanced because of a catalytic cycle consisting of electrochemical reduction of V(V) ion in the complex and subsequent chemical oxidation of the reduction product of V(V) by bromate. In pH 2.70 H2SO4 solution containing 5.0×10-6 mol•L-1 PAR and 3.0×10-2 mol•L-1 KBrO3 without any preconcentration, the linear sweep voltammetric peak current of the catalytic wave was proportional to the vanadium concentration in the range of 8.0×10-9 to 3.0×10-6 mol•L-1. The detection limit was 2.5×10-9 mol•L-1. Using the proposed method, the vanadium concentration in crude oil was evaluated and the results were compared with those of atomic absorption spectrometry.

• Periodical: Advanced Materials Research (Volumes 634-638)
• Pages: 64-67
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.634-638.64
• Online since: January 2013
• Authors: Li Zheng, Ying Zhang
• Keywords: 4-(2-Pyridylazo)-Resorcinol, Catalytic Voltammetric Wave, Crude Oil, Multi-Walled Carbon Nanotube (MWCNT), Vanadium

References

[1] M.F. Ali and S. Abbas: Fuel Process. Technol. Vol. 87 (2006), p.573

[2] F.A.C. Amorim, B. Welz, A.C.S. Costa, F.G. Lepri, M.G.R. Vale and S.L.C. Ferreira: Talanta Vol. 72 (2007) , p.349

[3] H. Xu, D. Yu, Z. Wang and G. Que: Petro. Ref. Eng. Vol. 30 ( 2000), p.1

[4] J.G. Bergmann, C.H. Ehrhardt, L. Granatelli and J.L. Janik: Anal. Chem. Vol. 39 (1967), p.1258

[5] S.R. Liu, X.J. Ren and Q.Y. He: Acta Petrolei Sinica (Petroleum Processing Section) Vol. 19 (2003), p.52

[6] M.Y. Khuhawar and S.N. Lanjwani: Talanta Vol. 43 (1996), p.767

[7] J.L. Fabec and M.L. Ruschak: Anal. Chem. Vol. 57 (1985), p.1853

[8] F.G. Lepri, B. Welz, D.L.G. Borges, A.F. Silva, M.G.R. Vale and U. Heitmann: Anal. Chim. Acta Vol. 558 (2006), p.195

[9] S.B.O. Adeloju and F. Pablo: Anal. Chim. Acta Vol. 288 (1994), p.157

[10] A.K. Hsieh and T.H. Ong: Microchim. Acta Vol. 105 (1991), p.117

[11] A. Bobrowski, K. Nowak and J. Zarebski: Anal. Chim. Acta Vol. 543 (2005), p.150

[12] Y.X. Wang, Y.H. Li and X.Y. Ruan: Chin. J. Anal. Chem. Vol. 32 (2004), p.1206

[13] J. Wang, D. Lu, S. Thongngamdee, Y. Lin and O.A. Sadik: Talanta Vol. 69 (2006), p.914

[14] R. Piech, B. Baś, B. Paczosa-Bator and W.W. Kubiak: J. Electroanal. Chem. Vol. 633 (2009), p.333

[15] Y.H. Li, Y.X. Wang and W.H. Huang: Electroanalysis Vol. 20 (2008), p.1440

[16] P.H. Deng, J.J. Fei, J. Zhang and J.N. Li: Microchim. Acta Vol. 165 (2009), p.211

[17] L. Zheng and J.F. Song: Anal. Biochem. Vol. 391 (2009), p.56

[18] GB/T 18608-2001, Standards Press of China, Beijing (2001).

[19] Z.X. Zhang, and Y.F. Tu: Chem. J. Chin. Univ. Vol. 6 (1985), p.403

[20] N. Liu and J.F. Song: Anal. Bioanal. Chem. Vol. 383 (2005), p.358

[21] R.S. Nicholson and I. Shain: Anal. Chem. Vol. 36 (1964), p.706