Abstract
Electrooxidation of ascorbate has been studied with the use of a rotating disk electrode. The results obtained show an efficient electrocatalytic oxidation of ascorbate at the Prussian blue (PB) modified electrode to proceed in solutions of pH 5.5 and 7.3. Depending on solution pH, the onset potential for ascorbate electrooxidation at PB modified electrode appears shifted by 0.1–0.2 V to lower values, as compared to an unmodified glassy carbon electrode. Within the electrode potential window of 0.3 to 0.5 V vs. Ag/AgCl, and electrode rotation velocity of 50–2000 rpm, the catalytic current obeys Koutecky-Levich equation at a submillimolar ascorbate concentration. Kinetic current densities, obtained from the data treatment, are higher for a pH 5.5 solution, and also at higher electrode potential.
[1] A.A. Karyakin, O.V. Gitelmacher, E.E. Karyakina, Anal. Lett. 27, 2861 (1994) 10.1080/00032719408000297Search in Google Scholar
[2] A.A. Karyakin, O.V. Gitelmacher, E.E. Karyakina, Anal. Chem. 67, 2419 (1995) http://dx.doi.org/10.1021/ac00110a01610.1021/ac00110a016Search in Google Scholar
[3] F. Ricci, G. Palleschi, Biosens. Bioelectron. 21, 389 (2005) http://dx.doi.org/10.1016/j.bios.2004.12.00110.1016/j.bios.2004.12.001Search in Google Scholar
[4] A.A. Karyakin, Electroanalysis 13, 813 (2001) http://dx.doi.org/10.1002/1521-4109(200106)13:10<813::AID-ELAN813>3.0.CO;2-Z10.1002/1521-4109(200106)13:10<813::AID-ELAN813>3.0.CO;2-ZSearch in Google Scholar
[5] K.C. Pan, C.S. Chuang, S.H. Cheng, Y.O. Su, J. Electroanal. Chem. 501, 160 (2001) http://dx.doi.org/10.1016/S0022-0728(00)00519-210.1016/S0022-0728(00)00519-2Search in Google Scholar
[6] K. Ogura, M. Higasa, J. Yano, J. Electroanal. Chem. 379, 373 (1994) http://dx.doi.org/10.1016/0022-0728(94)87160-410.1016/0022-0728(94)87160-4Search in Google Scholar
[7] H. Zhao, Y. Yuan, S. Adeloju, G.G. Wallace, Anal. Chim. Acta 472, 113 (2002) http://dx.doi.org/10.1016/S0003-2670(02)00937-610.1016/S0003-2670(02)00937-6Search in Google Scholar
[8] K.C. Ho, C.Y. Chen, H.C. Hsu, L.C. Chen, S.C. Shiesh, X.Z. Lin, Biosens. Bioelectron. 20, 3 (2004) http://dx.doi.org/10.1016/j.bios.2003.11.02710.1016/j.bios.2003.11.027Search in Google Scholar
[9] W. Hou, E. Wang, J. Electroanal. Chem. 316, 155 (1991) http://dx.doi.org/10.1016/0022-0728(91)87043-410.1016/0022-0728(91)87043-4Search in Google Scholar
[10] E. Wilkins, M. Carter, J. Voss, D. Ivnitski, Electrochem. Commun. 2, 786 (2000) http://dx.doi.org/10.1016/S1388-2481(00)00122-310.1016/S1388-2481(00)00122-3Search in Google Scholar
[11] F. Ricci, F. Arduini, A. Amine, D. Moscone, G. Palleschi, J. Electroanal. Chem. 563, 229 (2004) http://dx.doi.org/10.1016/j.jelechem.2003.09.01610.1016/j.jelechem.2003.09.016Search in Google Scholar
[12] A. Malinauskas, G. Mickeviciute, R. Araminaite, R. Garjonyte, Chem. Anal. (Warsaw) 51, 809 (2006) Search in Google Scholar
[13] Z. Galus, Fundamentals of Electrochemical Analysis (Ellis Horwood, Chichester, 1976) Search in Google Scholar
[14] A.J. Bard, L.R. Faulkner, Electrochemical methods. Fundamentals and applications, 2nd edition (Wiley, New York, 2001) 331 Search in Google Scholar
[15] R. Naujikas, A. Malinauskas, F. Ivanauskas, J. Mathemat. Chem. 42, 1069 (2007) http://dx.doi.org/10.1007/s10910-006-9172-z10.1007/s10910-006-9172-zSearch in Google Scholar
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