A RAPID AND PRACTICAL STRATEGY FOR THE DETERMINATION OF PLATINUM, PALLADIUM, RUTHENIUM, RHODIUM, IRIDIUM AND GOLD IN LARGE AMOUNTS OF ULTRABASIC ROCK BY INDUCTIVELY COUPLED PLASMA OPTICAL EMISSION SPECTROMETRY COMBINED WITH ULTRASOUND EXTRACTION

摘要

This proposed method regulated the determination of platinum, palladium, ruthenium, rhodium, iridium and gold in platinum-group ores by nickel sulfide fire assay—inductively coupled plasma optical emission spectrometry (1CP-OES) combined with ultrasound extraction for the first time. The quantitative limits were 0.013-0.023 |ag/g. The samples were fused to separate the platinum-group elements from matrix. The nickel sulfide button was then dissolved with hydrochloric acid and the insoluble platinum-group sulfide residue was dissolved with aqua regia by ultrasound bath and finally determined by ICP—OES. The proposed method has been applied into the determination of platinum-group element and gold in large amounts of ul-trabasic rocks from the Great Dyke of Zimbabwe.