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

Authors
Mark, HB Zhang, H Lunsford, SK Ceylan, O Khaskelis, AI Atta, N Galal, A Hausner, S Rubinson, JF Russell, GC Zimmer, H Kreishman, GP
Citation
Hb. Mark et al., Synergetic effects in the flow injection analysis determination of catechol in the presence of excess ascorbic acid by series dual-band amperometric detection, ANALYT CHIM, 385(1-3), 1999, pp. 281-285
Citations number
7
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences
Journal title
ANALYTICA CHIMICA ACTA
ISSN journal
00032670 → ACNP
Volume
385
Issue
1-3
Year of publication
1999
Pages
281 - 285
Database
ISI
SICI code
0003-2670(19990405)385:1-3<281:SEITFI>2.0.ZU;2-9
Abstract
The deviations at high concentrations (>10(-5) M) in the calibration curves for the determination of catechol in catechol/ ascorbic acid mixtures by f low injection analysis using series dual-band poly(3-methylthiophene)-coate d electrodes has been re-examined, The cyclic voltammetry (at pH congruent to 7.4) of catechol/ascorbate and catechol/urate mixtures and NMR measureme nts show these deviations are the result of the simultaneous homogeneous ca talytic reaction of dehydrocatechol with ascorbate. (C) 1999 Elsevier Scien ce B.V. All rights reserved.