"Electrooxidation Of Thiocyanate On Copper-modified Gold Electrode And Its Amperometric Determination By Ion Chromatography"
Analyst
1998 Volume 123, Issue 6 Pages 1359-1363
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Innocenzo G. Casella*, Maria R. Guascito and Giuseppe E. De Benedetto
Abstract:
Cyclic voltammetry was used to study the electrochemical behavior of an Au/Cu electrode towards the electrooxidn. of thiocyanate ion in alkaline medium. The effects of pH, Cu loading, scan rate and applied potential on the electrocatalytic oxidation of thiocyanate were studied. Flow injection experiments and ion-chromatography (IC) were performed to characterize the electrode as an amperometric sensor for the thiocyanate determination The effects of carbonate concentration. and common interferents on the retention time were also estimated. The electrode stability, precision, limit of detection and linear range were evaluated at a constant applied potential of 0.7 V vs. Ag/AgCl. Calibration plots, obtained in IC, were linear from 1.0 to 195 µM (correlation coefficient of 0.9984). The detection limit (LOD) was 0.5 µM (29 ppb) in a 50 µL injection. An example of anal. application, which includes the IC separation and detection of thiocyanate ion present in human urine, is given.
Thiocyanate ion
Urine
Apparatus
Detector
Interferences
