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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Amperometry

Classification: Amperometry -> anodic

Citations 3

"Anodic Amperometry And Kinetics Of 2 To 4-carbon Glycols At The Nickel Electrode"
Anal. Chim. Acta 1988 Volume 208, Issue 1-2 Pages 247-254

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Nader Botros and Calvin O. Huber

Abstract: Anodic amperometry of nine C3 and C4 alcohols and diols, plus ethanediol and glycerol, was studied at +0.55 V (vs. the SCE) in 0.1 M NaOH containing suspended Ni(OH)2 (from adding 10 mM NiSO4). The flow injection cell contained a 10-mm Ni-wire (0.64 mm diameter) working electrode and a 20-mm Pt-wire auxiliary electrode. The upper limit of rectilinearity (peak current vs. concentration.) was ~0.25 mM and the lower detection limit was 0.2 µM (propane-1,3-diol). Primary alcohols yielded larger current sensitivities than secondary alcohols.
Alcohols, primary Alcohols, secondary Butanol, 1- 2-Propanol 1-Propanol Diols 1,1-Ethanediol Glycerol Apparatus Kinetic Sensitivity

"Improved Mediated Tyrosinase Amperometric Enzyme Electrodes"
J. Electroanal. Chem. 1997 Volume 425, Issue 1-2 Pages 1-11

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Maria Hedenmo, Arántzazu Narváez, Elena Domínguez* and Ioanis Katakis

Abstract: The electroreduction of the quinonoid products of the oxidation of phenols by monophenol monooxygenase in carbon-paste electrodes to two-electron-donating phenolic species in order to regenerate the active (oxy-) form of the enzyme in the presence of O2 has been made more efficient by the incorporation of bis-(4,4'-dimethyl-2,2'-bipyridyl)(1,10-phenanthroline-5,6-dione)osmium chloride as mediator in the carbon paste. The reduction-current response was thereby rendered mass-transport-limited. Both batch cyclic-voltammetric and flow injection experiments are described. Under flow injection conditions the presence of the mediator increased the current density threefold, decreased the detection limit by nearly two orders of magnitude, and increased the lifetime by more than one order of magnitude. For injection of a 20 µL sample into a carrier stream of 0.25 M phosphate buffer of pH 6.0 (0.7 ml/min) with the electrode maintained at -0.5 V vs. Ag/AgCl, the detection limits for phenol and catechol were both 10 nM, as compared with 500 nM and 250 nM, respectively, in the absence of the mediator.
Phenol Catechol Detection limit Enzyme Method comparison

"Flow Injection Analysis With Amperometric Detection Of Naltrexone In Pharmaceuticals"
J. Pharm. Biomed. Anal. 1997 Volume 16, Issue 1 Pages 15-19

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M. T. Fernández-Abedul and A. Costa-Garcia*

Abstract: Flow injection analysis (FIA) with amperometric detection using a carbon paste electrode is applied to the determination of naltrexone. The sample solution was injected into the carrier stream of 0.1 M perchloric acid, being determined by oxidation at +1.0 V vs. Ag/AgCl/sat. KCl using a flow rate of 4 mL min-1. A relative standard deviation of 1.5% was calculated for a concentration level of 10^-5 M (n = 17) without carrying out a carbon paste electrode pretreatment. Calibration curves were found to be linear between 2 x 10^-8 and 10^-5 M (almost three orders of magnitude) and the method has a detection limit of 2 x 10^-8 M. A simple and reproducible procedure is proposed for the determination of naltrexone in pharmaceuticals. The results compared favourably with those obtained by an HPLC-UV method.
Naltrexone Pharmaceutical Detection limit Linear dynamic range Method comparison