File:Investigation of the Platinum Metals- IV. Determination of iridium in platinum alloys by the method of fusion with lead (IA scientificpapers48319geor).pdf
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[edit]Investigation of the Platinum Metals: IV. Determination of iridium in platinum alloys by the method of fusion with lead
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| Author |
Gilchrist, Raleigh |
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| Title |
Investigation of the Platinum Metals: IV. Determination of iridium in platinum alloys by the method of fusion with lead |
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| Volume | 19, no. 483 | |
| Publisher |
National Bureau of Standards |
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| Description |
A study has been made of the analytical details of the Deville and Stas method for the determination of iridium in platinum alloys containing from 0.1 to 20 percent of iridium. Specially prepared alloys made from highly purified metals were used in the investigation. It was found that the concentration of nitric acid, the concentration of aqua regia, the proportion of lead, and the time and the temperature of the lead fusion can be varied over a wide range without affecting the determination. The observations of Deville and Stas that palladium and rhodium have no effect upon the determination and that ruthenium separates quantitatively with the iridium were confirmed. In addition gold was found not to interfere. Iron separates nearly quantitatively with the iridium as observed by Deville and Stas. A method for the separation of iron from the iridium was tested and found to give satisfactory results. The loss in weight of crystalline iridium during the ignition periods is insignificant and the weight of crystalline iridium is not affected by heating and cooling in an atmosphere of hydrogen. Spectrographic examination of samples of iridium from analysis showed that neither platinum nor lead was present in sufficient quantities to affect the determination. The iridium results tend to be low by a variable but usually small amount. One factor in this error is a slight solution of iridium by aqua regia. A modified procedure for the method is offered, which combines the optimum conditions for speed and accuracy In the various details of manipulation. Subjects: |
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| Language | English | |
| Publication date | 1923 | |
| Current location |
IA Collections: NISTresearchlibrary; fedlink; americana |
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| Accession number |
scientificpapers48319geor |
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| Source | ||
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| current | 21:48, 9 September 2020 |  | 1,016 × 1,456, 40 pages (1.5 MB) | Fæ (talk | contribs) | FEDLINK - United States Federal Collection scientificpapers48319geor (User talk:Fæ/IA books#Fork8) (batch 1000-3000 #229877) |
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