| An ICP-AES method was established for determination of platinum, palladium and rhodium contents in the Fe-PGM alloy produced from plasma smelting process. Prior to ICP-AES measurements, the alloy was first pretreated by alkali fusion and then by tellurium co-precipitation separation. The conditions for the sample preparation and determination were investigated and optimized. When the alloy was fused with sodium peroxide in the muffle furnace at 730℃ for 25 min, the resulting melt could fully be dissolved in diluted hydrochloric acid. Slightly boiling the solution for 30 min after the addition of the tellurium reagent and SnCl2 would enhance the precipitation of platinum, palladium and rhodium. Under given conditions and for the Fe-PGM alloy containing 0.5~7.0 Pt, 2.0~40.2 Pd, and 0.2~7.0 Rh in g/kg unit, RSD (n=7~9) and the recovery of standard addition were found to be 0.44%~1.52%, 99.4%~101% for Pt, 0.58%~1.06%, 99.1%~100.5% for Pd, and 0.61%~1.98%, 98.3%~101% for Rh, respectively. |
