Trace determination of platinum-I. A catalytic method using pulse polarography.
Experimental conditions are given for the development of a well-defined catalytic polarographic wave for PT(II) after chelation with ethylenediamine. Direct-current polarographic studies of the wave characteristics indicate that it is of the catalytic hydrogen type, sensitive to pH changes, temperature, and electrode characteristics. By differential pulse polarography a single, sharp peak at -1.62 V is obtained, allowing trace determination of Pt(II) in the range 0.01-1.0 ppm with a linear calibration and a detection limit of 0.003 ppm. The catalytic wave is shown to suffer little interference from other platinum-group metals at 1:1 concentration ratio to Pt, except for Rh(III).
Alexander
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PW
Department of Analytical Chemistry, University of N.S.W., P.O. Box 1, Kensington, Australia 2033.
Hoh
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Smythe
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