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

Classification: Electrode -> copper -> tubular

Citations 4

"Flow Injection Analysis With A Coated Tubular Solid-state Copper(II)-selective Electrode"
Anal. Chim. Acta 1987 Volume 197, Issue 1 Pages 217-227

Notice (8): Undefined variable: uid [APP/View/Elements/citation.ctp, line 40]
J. F. van Staden and C. C. P. Wagener

Abstract: The electrode (Ibid., 1986, 179, 407) was activated by the deposition of copper sulfide inside a copper tube by circulating (2 mL min-1) 0.1 ppm ammonium sulfide followed by 20 ppm ascorbic acid. The detector was used in a flow injection system and showed rectilinear response between 10 and 5000 µg mL-1 of Cu(II) and a detection limit of 0.5 µg mL-1. Detector performance was evaluated with respect to system parameters, pH and the influence of foreign ions; interference was caused by Cl- and Br-. However, the electrode could be used for determination of Cu(II) in the presence of <0.25 g L-1 of Cl- in waste water and tap-water.
Copper(II) Water Waste Interferences

"Continuous-flow Determination Of Chloride In The Nonlinear Response Region With A Tubular Chloride Ion-selective Electrode"
Talanta 1987 Volume 34, Issue 11 Pages 921-926

Notice (8): Undefined variable: uid [APP/View/Elements/citation.ctp, line 40]
Hirokazu Hara* and Yoshiki WakizakaSatoshi Okazaki

Abstract: The tubular electrode is constructed from copper pipe (2 cm x 0.28 cm) plated internally with silver, which is then electro-oxidized in 0.1 M KCl to form a AgCl layer. This electrode is used in conjunction with an Orion double-junction reference electrode containing 1 M NaNO3 in 30% methanol solution as outer filling solution The electrode is incorporated into a microcomputer-aided flow system in which sample or standard solution is mixed with colloidal AgCl solution to remove Br- and I- before the sample is passed through the tubular electrode. The concentration. is interpolated with use of the spline function in the range 0.1 to 10 mg L-1 and the corresponding coefficient of variation were 10 to 2% (n = 5). The detection limit is ~0.1 mg l-1. Results of analysis of rain and snow containing >0.75 mg L-1 of Cl-1 agreed within 10% of those of ion chromatography (n = 12).
Chloride Snow Rain Computer Method comparison

"Continuous-flow Potentiometric Monitoring Of 2-amino-acids With Copper-wire And Tubular Electrodes"
Anal. Chem. 1981 Volume 53, Issue 11 Pages 1590-1594

Notice (8): Undefined variable: uid [APP/View/Elements/citation.ctp, line 40]
Peter W. Alexander and Carmelita Maitra

Abstract: A novel method for detection of amino acids in a continuous-flow system is reported with copper wire or copper tubular electrodes as potentiometric detectors. The copper electrodes are shown to respond to the anionic form of amino acids without addition of Cu(II) to the flow system, with a response dependent on flow rate, buffer pH, and the type of amino acid. At pH 7.1, 10 amino acids are determined in the continuous-flow system at concentrations as low as 1.0 X IOd M with a stable base line potential and freedom from electrode poisoning except in the case of cysteine. The wire electrode is shown to be useful as a universal detector for amino acids.
Amino Acids Glycine

"Application Of A Copper Tubular Electrode As A Potentiometric Detector In The Determination Of Amino Acids By High Performance Liquid Chromatography"
J. Chromatogr. A 1981 Volume 209, Issue 1 Pages 29-39

Notice (8): Undefined variable: uid [APP/View/Elements/citation.ctp, line 40]
P. W. Alexander, P. R. Haddad, G. K. C. Low and C. Maitra

Abstract: A copper tubular electrode (CTE) has been used as a potentiometric detector in the determination of amino acids by reversed-phase high-performance liquid chromatography. The reference electrode was an electrically grounded tubular platinum electrode inserted in the flow stream. Comparison with a variable-wavelength UV absorbance detector showed that the CTE gave comparable response time and sensitivity, but was much more selective, showing response only to copper-binding molecules. The CTE has been applied to the analysis of urine and an intravenous amino acid preparation; no sample pre-treatment was required, other than filtration. Microgram quantities of amino acids were readily detected by using the CTE.
Amino Acids