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Blowpipe Analysis

Blowpipe Analysis


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About the Book

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1879 Excerpt: ...a borax bead coloured blue by copper oxide, and the reducing flame be applied, the bead becomes brown. 159. Substances containing tin in an oxidized state are heated on charcoal with sodium carbonate and borax in the reducing flame. Malleable and easily fusible beads of metallic tin are thus obtained. If these be separated from the slag, and heated in the oxidizing flame, they are converted into white oxide, which is deposited on the charcoal in the immediate neighbourhood of the assay. By treatment with cobalt solution the incrustation becomes bluish-green. When occurring together with zinc, with which its reactions are very similar, tin can only be detected with certainty in the wet way. Sulphides are roasted, and then examined as above. 160. In metallic alloys tin is easily detected, since the bead cannot be kept bright and free from oxide even in the strongest reducing flame. Alloys of copper and tin (gun-metal, bell-metal and bronze), are examined as follows: The substance is fused with a flux consisting of one part of sodium carbonate, half a part of borax, and one-third part of silica in the reducing flame, until the metallic bead takes up a rotatory motion.' The oxidizing flame is then, applied mainly to the glass, and so that the bead may be in contact on one side with, the glass, and on the other with the charcoal. The tin becomes oxidized and is absorbed by the glass, whilst the copper remains behind. The latter is separated from the glass, and further treated with microcosmic salt, whilst the slag is pulverized and reduced on charcoal with carbonate of soda or of potash No. 49. Titanium. The reactions of titanium are given in pars. 65 and 88, and No. 46 of the table at the end of the book. 161. If titanic acid forms the main constituent of a min...


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Product Details
  • ISBN-13: 9781130034721
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 52
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1130034720
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 109 gr

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