DETERMINATION OF TRACES OF RUBIDIUM,STROTIUM AND BARIUM IN ORES AND MINERALS
铷、锶、钡无火焰原子吸收法测定

Determination of Traces of Rubidium, Strotium and Barium in Ores andMinerals. The sample is decomposed with hydrofluoric and perchloric acids, andthe solution is evaporated to dryness. The salts are dissolved in dilute nitricacid and a portion of the resulting solution is used to determine Ba.Anotherportion is used to determine Sr and Rb. Ascorbic acid is added to remove chloride anion in the form of volatileHCl, thus avoiding loss of volatile RbCl. The use of a pyrolytic graphite tubeatomizer and methaneargon as internal gas to prevent the formation of metal oxide has producced enhancement in sensitivity. The sensitivity of this method. Rb/1% absorption 1.1×10-11g; Sr/1% absorption 5.8×10-12g; Ba/1% absorption 5.5×10-11g.