Abstract
An ICP AES procedure is developed for the direct determination of all platinum-group metals (PGM) and Au in an extract based on the correlation between the main constituents of the analytical cycle. Concentrations interfering with the determination PGM and Au in the extract admissible for ICP AES were found. It was shown that the extraction system (a mixture of p-alkylaniline with oil sulfides in o-xylene or in post-xylene fractions) is compatible with ICP, ensures the 10- to 20-fold preconcentration of PGM and Au and the necessary depth of extract purification (106) of the interfering elements. The accuracy of the procedure is confirmed by results of analyses of seven certified reference samples (GSO) and the agreement with the results of the reference ETA AAS determination. The procedure was tested on raw materials and products of a copper-nickel plant for the determination of all PGM, including osmium and Au in the concentration range 10−7 to 10−4%.
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