Abstract
Fast-scan differential pulse polarography is a suitable method for the determination of trace amounts of amalgam forming metals in electrochemically enriched solution. The metal ions analyzed are first accumulated on the surface of a hanging mercury electrode by electrolysis at constant potential, approx. 200 mV more negative than is the half-wave potential of the corresponding metal ion. After a short oxidation interval the reformed metal ions are determined by cathodic potential scan with differential pulse technique. The sensitivity of the determination is equal to that of ASDPP determination; the sensitivity and selectivity can be improved by the addition of reagents forming insoluble compound with the metal ions analyzed.
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