Sammendrag
We have introduced a non-toxic electrode material similar to dental amalgam for use in volt-ammetry. Its electrochemical properties are like a silver electrode. However, it possesses a higher overvoltage towards hydrogen than silver, and therefore enables detection of metals like zinc, nickel and cobalt. As such solid electrodes are found to give stable results over sev-eral weeks, without any maintenance, and because this method greatly facilitates monitoring of heavy metals, attempts to apply such methods to various samples have been are carried out. The present paper deals with determination of zinc and lead at ng ml-1 levels in wines and spirits with only minor treatment of the samples. The procedure may easily be adapted to con-tinuous monitoring. We have previously found that audible sound may greatly increase the voltammetric signal using liquid mercury as well as silver as electrode material. This is also applied to the actual systems. Finally, model determinations of thallium in brandy with the introduced dental amalgam elec-trode are compared with AAS measurements. It was found that the electrode could be used repeatedly for all the measurements, without any fouling, and with results close to what is found by using AAS.
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