Contact Info
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
Electrode
Citations 3
"Evaluation Of Kel-F - Graphite Electrodes As Detectors For Continuous-flow Systems"
Anal. Chim. Acta
1981 Volume 124, Issue 2 Pages 321-331
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Abstract:
A new electrode material, fabricated from Kel-F powder and graphite powder by pressing at 250°C and 1000 p.s.i., is applied as a detector in a thin-layer, flow-through cell, for applications to continuous flow streams. The detector is useful in a wide range of solvents for a wide range of species. Applications are described for 1,1'-bis(hydroxymethyl) ferrocene (BHMF), ascorbic acid, ferrocene, phenol, and hydroquinone, using various aqueous and methanolic solvent/electrolyte compositions. Detection limits range from 800 pg for BHMF to less than 20 pg for phenol. Background current fluctuations are used to estimate flow rate stability, which is the dominant factor in setting detection limits.
Apparatus
Detector
"Flow Injection Determination Of Ergonovine Maleate With Amperometric Detection At The Kel-F-graphite Composite Electrode"
Talanta
1986 Volume 33, Issue 5 Pages 448-450
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Belal* and J. L. Anderson 'include - APP/View/Elements/citation.ctp, line 40 View::_evaluate() - CORE/Cake/View/View.php, line 971 View::_render() - CORE/Cake/View/View.php, line 933 View::_renderElement() - CORE/Cake/View/View.php, line 1224 View::element() - CORE/Cake/View/View.php, line 418 include - APP/View/Techniques/view.ctp, line 52 View::_evaluate() - CORE/Cake/View/View.php, line 971 View::_render() - CORE/Cake/View/View.php, line 933 View::render() - CORE/Cake/View/View.php, line 473 Controller::render() - CORE/Cake/Controller/Controller.php, line 968 Dispatcher::_invoke() - CORE/Cake/Routing/Dispatcher.php, line 200 Dispatcher::dispatch() - CORE/Cake/Routing/Dispatcher.php, line 167 [main] - APP/webroot/index.php, line 109
Abstract:
Tablets containing ergometrine maleate(I) were powdered and dissolved in the mobile phase [methanol - 0.01 M phosphate buffer - 2% Na acetate (pH 7) (1:4)] and subjected to flow injection analysis with amperometric detection with a Kel-F - graphite electrode at +0.85 V vs. silver - AgCl. The calibration graph was rectilinear for 1 to 20 µg mL-1 of I and the detection limit was 50 ng mL-1. The coefficient of variation were 1%, and the results agreed well with those obtained by the official USP method.
Drugs
Ergometrine maleate
Pharmaceutical
Method comparison
"Enhanced Poly(chlorotrifluoroethylene) Composite Electrodes"
Anal. Chem.
1991 Volume 63, Issue 6 Pages 653-656
Notice (8): Undefined variable: uid [APP/View/Elements/citation.ctp, line 40]Jeffrey E. Anderson, Jeffrey B. Montgomery, and Ren YeeCode Context?><?phpif($uid!='') {$viewFile = '/home/stuchalk/public_html/fad/app/View/Elements/citation.ctp' $dataForView = array( 'data' => array( 'Technique' => array( 'id' => '0114', 'label' => 'Electrode', 'level1' => 'Electrode', 'level2' => 'graphite', 'level3' => 'Kel F embedded', 'level4' => '', 'level5' => '', 'synonyms' => '', 'champ' => '', 'total' => '3', 'updated' => '0000-00-00 00:00:00', 'name' => 'Electrode, graphite, Kel F embedded', 'nametotal' => 'Electrode, graphite, Kel F embedded**3', 'first' => 'E' ), 'Citation' => array( (int) 0 => array( [maximum depth reached] ), (int) 1 => array( [maximum depth reached] ), (int) 2 => array( [maximum depth reached] ) ) ), 'c' => array( 'id' => '008614', 'authors' => 'Anderson, J.E.;Montgomery, J.B.;Yee, R.', 'authorsweb' => 'Jeffrey E. Anderson, Jeffrey B. 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Abstract:
A procedure is described for reducing the active site radii of graphite - poly(chlorotrifluoroethylene) (Kel-F) electrodes, which significantly enhances the current. Such electrodes can be used as voltammetric detectors in LC and flow injection analysis. The Kel-F - graphite mixtures were ground to a particle diameter of about 25 µm in a micronizing mill for 1 h prior to compression moulding. The resulting pellets were machined to a diameter of 3 mm and press-fitted into a pure Kel-F rod. Electrical contact was made with a brass rod and the electrodes were polished. Less time was required for polishing to a mirror-like surface than with electrodes made without grinding. It was also possible to produce electrodes with higher percentages of graphite.