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Extra resources for Analysis of Noble Metals. Overview and Selected Methods

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Determination of ruthenium. Evaporate the ruthenium distillate until the v o l u m e is reduced to about 3 0 ml (see N o t e 4 ) . C o o l and dilute to 5 0 ml with water. 5 50 50 20 20 Estimated Os 28 1 ATOMIC ABSORPTION aliquot portion containing 100 to 5 0 0 fig of ruthenium to a 10-ml volumetric flask, and add 0 . 4 ml of the uranium solution and 0 . 8 ml of aqua regia (see N o t e 5 ) . Dilute to the mark with 4 0 % hydrochloric acid. If an aliquot portion of more than 3 ml is required, evaporate the respective aliquot portion to about 3 ml, add 0 .

Calculation. Calculate the amount of o s m i u m in the s a m p l e , using the formula O s (%) Notes. 1. = Os(jLtg) dilution vol 10 (i aliquot x 100 mass of s a m p l e Before the distillation, the 6N hydrochloric acid in receivers E and F must be saturated with sulfur dioxide so that the o s m i u m tetroxide is reduced to o s m i u m sulfite. 2. The perchloric acid o x i d i z e s the ruthenium and the o s m i u m to the volatile tetrava- lent state. 3. The s u c c e s s i v e boiling of receivers B , C , and D transfers the o s m i u m into receivers E and F, where it is reduced to o s m i u m sulfite by the sulfur d i o x i d e .

44) applied an ac arc method to determine some 20 impurity elements, including platinum, palladium, rhodium, iridium, and ruthenium in refined selenium and tellurium. Egizbaeva et al. (45) deter­ mined small amounts of osmium in ores by a direct spectrographic method, 32 2 SPECTROCHEMICAL ANALYSIS OF THE PLATINUM METALS using a 12-A dc arc with a chamber electrode and a high resolution spectro­ graph. Berenshtein et al. (46) and Livshits (47) reported improved methods for chemical-spectrographic determination of platinum, palladium, and gold in sulfide ores and for palladium in copper-nickel sulfide ores.

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