By F. E. Beamish
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Extra so than any of the opposite significant teams of components within the periodic desk, the transition metals have formed human background and feature been the workhorses of undefined. the invention of steel copper ended the Stone Age and ushered within the Bronze Age. Alloys of iron (especially metal) later took over, and the Iron Age changed the Bronze Age.
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Extra resources for Analysis of Noble Metals. Overview and Selected Methods
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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