Synergetic effects in the flow injection analysis determination of catechol in the presence of excess ascorbic acid by series dual-band amperometric detection

The deviations at high concentrations (>10 −5 M) in the calibration curves for the determination of catechol in catechol/ascorbic acid mixtures by flow injection analysis using series dual-band poly(3-methylthiophene)-coated electrodes has been re-examined. The cyclic voltammetry (at pH≅7.4) of c...

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Bibliographic Details
Published in:Analytica chimica acta 1999-04, Vol.385 (1), p.281-285
Main Authors: Mark, Jr, Harry B, Zhang, Hong, K. Lunsford, Suzanne, Ceylan, Ozcan, Khaskelis, Anthony I, Atta, Nada, Galal, Ahmed, Hausner, Sven, Rubinson, Judith F, Russell, George C, Zimmer, Hans, Kreishman, George P
Format: Article
Language:English
Subjects:
Analytical chemistry
Ascorbic acid
Catechol
Chemistry
Dual band electrodes
Electrochemical methods
Exact sciences and technology
Flow injection analysis
Micro electrodes
Polymer electrodes
Synergetic effects
Uric acid
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Summary:The deviations at high concentrations (>10 −5 M) in the calibration curves for the determination of catechol in catechol/ascorbic acid mixtures by flow injection analysis using series dual-band poly(3-methylthiophene)-coated electrodes has been re-examined. The cyclic voltammetry (at pH≅7.4) of catechol/ascorbate and catechol/urate mixtures and NMR measurements show these deviations are the result of the simultaneous homogeneous catalytic reaction of dehydrocatechol with ascorbate.
ISSN:0003-2670
1873-4324
DOI:10.1016/S0003-2670(98)00585-6