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Official and Tentative Methods of Analysis Volume 1

Official and Tentative Methods of Analysis Volume 1


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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. 1920 Excerpt: ...(Added Chlorin in Chlorin-Bleached Flour).--Tentative: Weigh 20 grams of the flour into a flat-bottomed aluminium dish, X-10 cm. in diameter, and dry 5 hours in a boiling water or steam oven, transfer, with as little exposure to the air as possible, to a continuous fat extractor, and extract for 16 hours with anhydrous alcohol-free ether, which is also free from chlorin. Transfer the ether extract to a nickel dish and add 25 cc. of a solution containing 25 grams of sodium or potassium hydroxid and 15 grams of sodium nitrate per liter. Place the dish on a steam bath, evaporate to dryness and ignite in a muffle at a dull red heat until the contents are thoroughly charred. Extract the charred mass with 25 cc. of 1 per cent nitric acid CHLORIN. 17 Qualitative Test. (Chlorin-BUached Flours).--Tentative. and filter. Return the residue to the dish. char and again extract with 25 cc. of 1 per cent nitric acid, filter, wash with hot water, return to the dish and ignite to a white ash. Dissolve the ash in 5 per cent nitric acid and add the solution to the filtrates previously obtained. Determine the chlorin in the combined filtrates either gravimetrically, as directed in I, 16 (a), or volumetric-ally, as directed in II, 17, using N/50 solutions for greater accuracy.--! Special precautions should be taken that the air of the laboratory during the entire operation is not contaminated by chlorin or hydrochloric acid fumes and that all reagents employed are as free as possible from chlorin. In all cases a blank determination should be conducted at the same time and a correction introduced if necessary. NITRITE NITROGEN.--TENTATIVE. 19 RKAGENTS. (a) Sulphanilic acid solution.--Dissolve 0.5 gram of sulphanilic acid in 150 cc, of 20 per cent acetic acid., -.. (b) Alpha-naphth.


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Product Details
  • ISBN-13: 9781130074475
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 156
  • Spine Width: 8 mm
  • Width: 189 mm
  • ISBN-10: 1130074471
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 290 gr


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