A UNIFIED TECHNIQUE OF DETERMINING MASS FRACTIONS OF THE IMPURITIES IN PLATINUM-RHODIUM ALLOYS BY ATOMIC EMISSION SPECTROSCOPY (AES)

Abstract

A unified technique of AES determination of the impurities in platinum-rhodium alloys is presented. A distinctive feature of the technique is the possibility for analysis of the alloys of the grades not determined by GOSTs, which are widely used in industry. Almost no standard samples (their development is a long and expensive process) are available for such alloys. The technique provides determination of the impurities in platinum-rhodium alloys with rhodium contents of 0.1% – 35 % wt. without using an adequate standard sample for each particular alloy. The unified technique of AES determination of silver, gold, copper, iron, nickel, lead, palladium, antimony, tin, zinc and other in platinum-rhodium alloys (containing up to 36% of rhodium) is thus developed. Certified standard samples were used to plot the calibration curves. The accuracy indices of the developed unified technique are not inferior to those of the procedures developed earlier for platinum and platinum – rhodium alloys.