University of North Florida
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Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Email: schalk@unf.edu
Website: @unf

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Electrode

Citations 2

"Electrochemical Response Of A Polypyrrole-dodecylsulfate Electrode With Multicharged Cations And Vitamins B1 And B6. Application As A Microsensor In Flow Injection Analysis"
Anal. Chim. Acta 1996 Volume 336, Issue 1-3 Pages 47-56

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R. Carabias Martínez*, F. Becerro Domíngueza, I. M. Sierra Garcíaa, J. Hernández Méndeza, R. Córdova Orellanab and R. Schrebler Guzmánb

Abstract: The cited electrode was prepared by electropolymerization on to a Pt or vitreous C electrode (20 mm2 area) from a solution containing 0.23 M pyrrole/0.05 M SDS in 80% acetonitrile. A potential of +1.4 V vs. SCE was applied for 5 min followed by 5 potential scans from +0.7 V to -1.3 V and then a constant potential of +0.7 V for 5 min. The amperometric response of the electrode to multicharged cations (Cu2+, Sr2+, Ba2+, Mg2+ and Al3+) and vitamins [B1 (thiamine) and B6] was investigated by cyclic voltammetry by scanning the potential from +0.7 to -1.3 V at 25 mV/s. A linear relationship between the cathodic current at -0.8 V and the analyte concentration was obtained for concentrations up to 0.1-1 mM. The detection limits were 1 µM for all analytes except vitamin B6 (7.5 µM). RSD (n = 10) for concentrations of 0.1 mM were 1.7% (Ba2+) to 8% (thiamine). The electrode was used as an amperometric detector in a single channel FIA system with 10 mM glycine as the carrier stream (1.54 ml/min) and an injection volume of 200 µL. Linear calibration graphs were obtained for all analytes up to 1 mM except Al3+ (up to 0.1 mM). The detection limits were 0.1-0.34 µM. RSD (n = 10) were 0.6-1.6% at the 0.1 mM level.
Cations Copper(II) Strontium(II) Barium(2+) Magnesium(II) Aluminum(III) Vitamin B1 Vitamin B6 Detection limit Detector

"Electrochemistry Of Ascorbic Acid At Polypyrrole-dodecyl Sulfate Film-coated Electrodes And Its Application"
J. Electroanal. Chem. 1994 Volume 365, Issue 1-2 Pages 197-205

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Zhiqiang Gao*, Beshen Chen and Minxian Zi

Abstract: The voltammetric, amperometric and chronoamperometric behavior of ascorbic acid at such electrodes involved an oxidation peak at ~0 V (vs. SCE), i.e., 300 mV more negative than at an uncoated electrode. The properties of such electrodes were superior to polypyrrole films prepared in solution of inorganic anions. The low oxidation potential rendered the proposed electrodes suitable for the FIA determination of ascorbic acid. The RSD at the 30-50 mg level in single- and multi-vitamin tablets were 5.0%, and recoveries of standard additions to these sample solution were 94-107%.
Ascorbic acid Pharmaceutical Standard additions calibration