✍ Scribed by Miloslav Kopanica; František Vydra
No coin nor oath required. For personal study only.
Electrochemical stripping techniques, and anodic stripping voltammetry especially, are widely used methods for the determination of trace amounts of metals 1. Recently great interest has been paid to the application of solid electrodes in anodic stripping voltammetry. Platinum2-4, gold 5 -8, silver 9,1 o, Copper 11 and graphite 12 --15 electrodes have been investigated and it has been stated that the sensitivity of anodic stripping voltammetry is generally higher when solid electrodes are applied; in many cases the reproducibility is however very poor. The preparation and pretreatment of solid electrodes are most important because these factors determine the reproducibility and accuracy of the results. Various graphite forms were recently explored as electrode materials ~ 2-15 and electrodes prepared from pyrolytic graphite impregnated with wax were found most suitable for anodic stripping voltammetry 14. Eisner and Mark 14 have shown that wax impregnated pyrolytic graphite electrodes yielded voltammograms where silver exhibited one main and one or two secondary dissolution peaks in acidic, neutral and alkaline media.
The application of glassy carbon rotating electrodes in voltammetry has been studied in this laboratory ~6. During this study the pretreatment step was found to be very simple when the glassy carbon electrode was used. To obtain reproducible voltammograms a simple polish with very fine sand paper was quite satisfactory. In this work the use of rotating glassy carbon electrode in anodic stripping voltammetry was examined. Compared with other graphite forms, the stripping voltammograms recorded with the use of the glassy carbon electrode showed one sharp and narrow dissolution peak when a solution of one metal was analyzed. The technique described may be also applied to the analysis of mixture of two metals.
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