The Analysis of Silicate and Carbonate Rocks; A Revision of Bulletin 305

The Analysis of Silicate and Carbonate Rocks; A Revision of Bulletin 305

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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. 1910 edition. Excerpt: ...acid, after which either sulphuric or nitric acid free from chlorine is added, together with water, and as much of the residue is brought into solution as possible. What remains insoluble is usually barium and calcium sulphates. This is filtered off on a small filter, the filtrate is caught in a small beaker or flask, and the manganese determined as in the following paragraphs. b. COLORIMETRIC DETERMINATION OF MANGANESE BY AMMONIUM PERSULPHATE." This method has the advantage over that by lead peroxide in that, unless chlorides happen to be in the solution, no filtration is necessary. Two solutions are needed, one of silver nitrate containing 2 grams of the salt to the liter, and one of manganous sulphate or nitrate containing the equivalent of 2 mg. of Mn0 in 10 cm.3. This last can be conveniently made by acidifying a standard permanganate solution, reducing it by sulphurous acid, and diluting appropriately. A solution of permanganate can be used directly as a color standard when very small quantities of manganese are in question. Ammonium persulphate in the solid form is also needed. The commercial article needs no purification ordinarily in this case. The rock solution must be strongly acid with nitric or sulphuric acid and considerably less than 100 cm.3 in bulk unless the manganese exceeds 1 milligram in weight. To it is added 10 cm.3 of the silver solution for every milligram of metallic manganese, and it is transferred to a graduated flask of size suited to the solution. Should it show a turbidity from precipitated silver chloride, the liquid must be agitated and then filtered into the flask. There is now added about 1 gram of solid ammonium persulphate and the flask is placed on the steam bath or hot plate. Very soon the more

Product details

  • Paperback | 104 pages
  • 189 x 246 x 6mm | 200g
  • United States
  • English
  • black & white illustrations
  • 1236928342
  • 9781236928344