Trace determination of platinum-II. Analysis in ores by pulse polarography after fire-assay collection.
A pulse-polarography method is described for the determination of traces of platinum in ores after fire-assay separation and preconcentration. The silver bead from the fire assay is dissolved and treated with ammonia and ethylenediamine to produce a sensitive catalytic polarographic wave. Measurement of the wave by differential pulse polarography allows determination of Pt with a detection limit of 0.0025 ppm. Platinum in ore samples was determined in the range 0.1-0.9 ppm and a correlation coefficient of 0.98 was obtained on comparison with AAS results.
Alexander
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PW
Department of Analytical Chemistry, University of N.S.W., P.O. Box 1, Kensington, N.S.W., Australia 2033.
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Smythe
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LE