Bulletin - Bureau of Chemistry Volume 28-35

Bulletin - Bureau of Chemistry Volume 28-35

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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. 1890 edition. Excerpt: ...the whole to decompose the acetates. By this method seeds, etc., may be incinerated in eight to ten hours. In whatever way obtained, the whole of the ash should be pulverized and intimately mixed before analysis. ANALYSIS OF WOOD ASHES. Weigh out 100 grs. of the air-dry ash, and pass through a wire sieve (20 meshes to the inch) to separate materials manifestly foreign, e. g., nails, broken glass and pottery, pebbles, eto., and estimate the per cent of such accidental materials. Pulvcrize any charcoal and semifnsed portions of ash remaining on the sieve, sift them and mix intimately with the sifted ash, and preserve in stoppered bottles for analysis. ' 1.. oislure.--Veigh out 5 grs. of the ash in a tared platinum dish and heat to 110 C., in an air bath to constant weight. Cool in a desiccator and weigh. The loss of weight x 20 = per cent of moisture in the ash. _ 2. Ca-rbon.--Heat this dried ash in a platinum dish in the sheet-iron-and-cone apparatus described for iucineratiug organic substances, till the ash is uniformly grayishwhite and there is no further loss of weight; weigh and determine this loss of weight, which X 20 = per cent of charcoal in original ash. 3. Sand and ailica.--Place this ignited ash in a4-ounce glass-stoppered vial; measure out 50 cc. of HCI (sp. gr. 1.115) and pour onto the ash cautiously to prevent loss of ash by spurting, and when all effervescence has ceased, add the balance of the acid; insert the glass stopper, wire it securely, and place in a steam bath (described under soil analysis) for two hours; empty the vial into a platinum dish, wash the vial with distilled water, adding the washings to the ash solution, and evaporate the whole to dryness on a water bath. Add 10 cc. of dilute HCI and 50 cc. of...
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Product details

  • Paperback | 614 pages
  • 189 x 246 x 31mm | 1,080g
  • United States
  • English
  • black & white illustrations
  • 1236740335
  • 9781236740335