FAD: Techniques

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

Classification: Electrode -> cobalt

Citations 2

'Amperometric Detection Of Amines Using Cobalt Electrodes After Separation By Ion-moderated Partition Chromatography', Talanta, 1997 44(2) 239-248

"Amperometric Detection Of Amines Using Cobalt Electrodes After Separation By Ion-moderated Partition Chromatography"
Talanta 1997 Volume 44, Issue 2 Pages 239-248

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A. Hidayata, D. B. Hibberta,* and P. W. Alexanderb

Abstract: Amines were separated by HPLC on an Aminex HPX-72-0 column (30 cm x 7.8 mm i.d.) with 75 mM NaOH as mobile phase (0.75 ml/min) and amperometric detection at 0.4 V vs. Ag/AgCl using a Co working electrode. Results were compared with those obtained using a Cu electrode. FIA experiments were also performed using 75 mM NaOH as carrier (0.75 ml/min). The addition of organic modifier did not improve the results. The RSD n = 10) was 1.3% for 12 nmol methylamine. The electrode response was stable for 3-4 days. Separation of six amines was achieved using the HPLC method with retention time RSD of Calibration graphs were linear for 30 (for benzylamine) to 300 (methylamine) times the limit of detection (6.3 and 0.5 nmol, respectively).

Amines, alkyl Amines, aromatic Method comparison

'A Metallic Cobalt Electrode For The Indirect Potentiometric Determination Of Calcium And Magnesium In Natural Waters Using Flow Injection Analysis', Talanta, 1998 47(3) 779-786

"A Metallic Cobalt Electrode For The Indirect Potentiometric Determination Of Calcium And Magnesium In Natural Waters Using Flow Injection Analysis"
Talanta 1998 Volume 47, Issue 3 Pages 779-786

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ZuLiang Chen* and Mark A. Adams

Abstract: A flow injection analysis of Ca2+ and Mg2+ using indirect potentiometric detection in natural waters is proposed, where Ca2+ or Mg2+ are injected into a buffer carrier containing phosphate, resulting in the formation of Ca3(PO4)2 or Mg3(PO4)2. The consequent reduction in free phosphate in the carrier solution is detected using a metallic cobalt wire electrode. Indirect electrode response was used and the experimental conditions affecting electrode response were optimized. Responses were linear at concentrations 5 x 10^-4 - 5 x 10^-3 M with a detection limit of 1 x 10^-5 M in 20 mM phosphate buffer at pH 8.0. The relative standard derivation at 1 mM of Ca2+ and Mg2+ were 3.9 and 3.7% (n = 10), respectively. EGTA and 8-hydroxyquinoline were used as the masking agents for Ca2+ and Mg2+, respectively. Concentrations of Ca2+ and Mg2+ in natural waters were determined by this method.

Calcium Magnesium Environmental Indirect Optimization 8-Hydroxyquinoline Interferences