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| Expertize and diagnostics at the Russian State Depository for precious metals and gems | |
| ArticleName | Nondestructive methods for research during expertize of platinum coins and jewelleries |
| ArticleAuthor | Goldshtrakh M. A., Obrezumov V. P., Zhitenko L. P., Buzin V. I. |
| ArticleAuthorData | M. A. Gol'dshtrakh, Candidate of Chemistry Science, Chief Specialist; V. P. Obrezumov, Candidate of Engineering Science, Deputy Head of Department; L. P. Zhitenko, Candidate of Chemistry Science, Chief Expert; V. I. Buzin, Chief Expert; e-mail: expgokhr@yandex.ru; Gokhran of Russia. |
| Abstract | The results of research and expertize of jewelleries and coins, produced from platinum alloys, with methods of X-ray fluorescence analysis and hydrostatic weighing have been presented. The data about composition, homogeneity and density of platinum alloys are obtained. It has been established that platinum content in the examined Russian coins of Nickolas I period made 96-99% (mass.), while the main additive impurities are Ir (up to 2%), Fe (up to 2%), Cu (up to 0.5%), Rh and Pd (~0.1%). Alloy density of these coins constitutes 19.3-21.2 g/cm3. It is concluded about possibility of usage of the a.m. methods in the expertise of authenticity of the coins and other products. |
| keywords | Platinum, coins, spectrometry, X-ray spectrometry analysis, minting, products, density. |
| References | 1. Milazzo M. Nucl. Instr. and Meth. in Phys. Res. B. 2004. Vol. 213. pp. 683– 692. 2. Revenko A. G., Revenko V. A. Metody i obekty khimicheskogo analiza. Methods and objects of chemical analysis. 2007. Vol. 2, No. 1. pp. 4–29. 3. Zhitenko L. P., Obrezumov V. P., Bukhryakova S. K. and etc. Zavodskaya laboratoriya. Diagnostika materialov. Factory laboratory. Materials diagnosis. 2008. Vol. 74, No. 8. pp. 4–14. 4. Raub C. J. Platinum Metals Rev. 2004. Vol. 48, No. 2. pp. 66–69. 5. Lupton D. F. Platinum Metals Rev. 2004. Vol. 48. No. 2. pp. 72–78. 6. Willey D. B., Pratt A. S. Platinum Metals Rev. 2004. Vol. 48, No. 3. pp. 134– 138. 7. Rehren T. Platinum Metals Rev. 2006. Vol. 50, No. 3. pp. 120–129. |
| Language of full-text | russian |
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