Technical Methods of Chemical Analysis Volume 1, PT. 1

Technical Methods of Chemical Analysis Volume 1, PT. 1

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 edition. Excerpt: ... calorimetric value of fuel, by Parr's method (p. 256). A modification of this method is described by Schillbach.6 With the object of avoiding the possibility of error, from sulphur formed in the combustion of the gas used for heating, Brunck7 has proposed a method for the determination of sulphur in coal, which consists in heating I g. of the sample, mixed with 2 g. ofa mixture of 2 parts of cobalt oxide and I part of sodium carbonate, in a current of oxygen. The combustion is completed in fifteen minutes. The products of the oxidation are extracted with vater, the cobalt oxide filtered off, and the sulphuric acid estimated gravimetrically. With certain coals, the oxide of cobalt may retain sulphur as a basic sulphate, which must be tested for and determined, if present. The Volatile Sutjohur can be ascertained by subtracting the sulphur of the ash from the total sulphur, or it may be determined directly, by combustion of the coal in a current of oxygen. This latter determination is carried out in the same way as an organic analysis, but a larger DETERMINATION OF ARSENIC, PHOSPHORUS AND NITROGEN 247 weight of sample is necessary (0-8 to I g.), and the combustion tube should contain a short length of platinum clippings at n (Fig. 112), instead of the usual copper oxide. The sulphur dioxide and trioxide produced are passed into hydrogen peroxide, and the sulphuric acid thus produced is either precipitated as barium sulphate or is titrated with N/IO potassium hydroxide. Arsenic has been found in certain samples of English coal and coke;1 methods for its estimation have been described by Thorpe,2 and by M'Gowan and F lorisf' Phosphorus.-The estimation of phosphorus is necessary only for metallurgical purposes. One to two g. of...
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Product details

  • Paperback | 200 pages
  • 189 x 246 x 11mm | 367g
  • United States
  • English
  • black & white illustrations
  • 1236964012
  • 9781236964014