Abstract
A spectrographic method was required for the determination of traces of Ir, Ru, Au, Pd, Ag, Cu, Ni, Fe, Co, Mn, Ti, Pb, Sn, Sb, As, Zn, Al, Si and Mg in platinum—rhodium alloys without the need for a lengthy sample-preparation step. For calibration purposes, samples similar in composition to the alloys were prepared both by melting samples of the pure metals to which traces had been added, and by thorough mixing of metals in powder form, covering the concentration range 5 × 10 −4 to 10 −1%. Chemical and spectrographic tests showed that the homogeneity of the samples was more than adequate for the purpose. The spectrographic procedure used anodic excitation in a globule arc and a water-cooled graphite plate as sample-carrier, together with a plane-grating spectrograph PGS 2. Calibration curves were linear over wide sections of the concentration ranges of interest. For levels around 0.01% the coefficients of variation lay between 10 and 30%. Results were compared for differently prepared samples and for alloys with varying rhodium contents.
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