Download Analysis of Ancient Metals by Earle R. Caley PDF

By Earle R. Caley

ISBN-10: 0080106668

ISBN-13: 9780080106663

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Extra resources for Analysis of Ancient Metals

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B. H O F M A N N , Beiträge zur Geschichte der antiken Legirungen, Numismatische Zeitschrift, 16, 1-57 (1884). Κ . B. H O F M A N N , Zur Geschichte der antiken Legirungen, Numismatische Zeitschrift, 17, 1-50 (1885). F. H U L T S C H , Annähernde Bestimmung der Mischungsverhältnisse einiger Elektronmünzen, Zeitschrift für Numismatik, 11, 161-166 (1884). H. M A T T I N G L Y , Coins of the Roman Empire in the British Museum, Vols. M i l , London (1923-1936). Ε. H. ], 17, 309-333 (1877). W . W R O T H , Catalogue of the Greek Coins of Mysia, London (1892).

Filter off any precipitate that appears, heat the solution nearly to boiling, add 2 ml of a freshly prepared 10 per cent solution of diammonium hydrogen phosphate, shake or stir for a few minutes, and stand for at least 10 min. The formation of a white crystalline precipitate shows the presence of zinc. Tests for Arsenic and Antimony Place the sample in a 100-ml beaker, and add l O m i of concentrated nitric acid. When the reaction has ceased, add cautiously 0-5 ml of concentrated sulfuric acid dropwise.

General Qualitative Procedure Step 1. Place a sample of about 50 mg in a 100-ml beaker, add 10 ml of 1:1 nitric acid, and heat nearly to the boiling point. If the sample is not noticeably attacked by the acid (indicating an alloy containing more than 25 per cent gold), continue the analysis as described under (a). If it is readily attacked continue as described under (b). (a) Evaporate the acid to 2 ml and cautiously add 6 ml of concentrated hydrochloric acid. When the reaction ceases, dilute to 50 ml.

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