By F. E. Beamish
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Additional resources for Analysis of Noble Metals. Overview and Selected Methods
They studied both spark and arc spectra, using a Hilger medium quartz spectrograph. In 1940 Toisi (62) described two methods for the assay of minerals and applications of these to gold ores. In one method a powdered sample was streamed into the arc; in the other the electrodes were impregnated with gold solution. Pardo (63) described a method of concentrating precious metals by fire assay and a subsequent spectrographic determination of their concentrations in silver beads. In assaying Spanish ores (64) he used this method and an alternate one in which the gold was concentrated by electrolysis in the cavity of a carbon rod.
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 .
For the measurement at 1300°C. of noble metals in solutions of gold prills that have been cupelled Follow the calibration procedure g i v e n a b o v e , but do not add silver or lead to the standard solutions because these metals are unlikely to be present in the sample solutions. Construct calibration curves of absorbance versus concentration. For the measurement of noble metals and lead in solutions of silver prills. 6) of noble metals and lead to 100-ml volumetric flasks. T o each of the flasks, add 2 0 ml of concentrated hydrochloric acid and then 5 ml of the stock solutions for silver ( i .
Analysis of Noble Metals. Overview and Selected Methods by F. E. Beamish