Abstract
The selectivity of catalytic methods can be increased if the metal ion to be determined is extracted and then determined catalytically in non-aqueous medium. This possibility is demonstrated for the example of copper determination based on its catalytic effect on the oxidation of sulphanilic acid by hydrogen peroxide, activated with pyridine. Copper is extracted as a mixed pyridine salicylate complex, with chloroform, and the extract is added directly to the solution of all reagents in ethanol. By selection of the most suitable conditions copper can be determined in the range 3–60 ng/ml. The coefficient of variation of the method was 11.2% for 30 ng of Cu(II)/ml. The influence of various metal ions was compared for the catalytic determination with and without extraction.
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