Circular of the Bureau of Standards Volume 76-100

Circular of the Bureau of Standards Volume 76-100

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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. 1919 edition. Excerpt: ... are present. If the solution is not clear, the oil is not pure linseed oil. () Iodine Number Of Fatty Acids.--Place a small quantity of the fatty acids (g) in a small weighing burette or beaker. Weigh accurately. Transfer by dropping about 0.15 g (0.10 to 0.20 g) into a 500 cc bottle having a well-ground glass stopper, or an Erlenmeyer flask having a specially flanged neck for the iodine test. Reweigh the burette or beaker and determine amount of sample used. Add 10 cc of chloroform. Whirl the bottle to dissolve the sample. Add 10 cc of chloroform to two empty bottles like that used for the sample. Add to each bottle 25 cc of the Hanus solution (see reagents) and let stand with occasional shaking for one-half hour. Add 10 cc of the 15 per cent potassium iodide solution and 100 cc of water, and titrate with standard sodium thiosulphate using starch as indicator. The titrations on the two blank tests should agree within 0.1 cc. From the difference between the average of the blank titrations and the titration on the sample and the iodine value of the thiosulphate solution, calculate the iodine number of the sample tested. (Iodine number is centigrams of iodine to 1 g of sample.) If the iodine number is less than 170, the oil does not meet the specification. (y) Coarse Particles And Skins.--Dry in an oven at 105 to 1100 C a No. 200 sieve, cool, and weigh accurately. Weigh an amount of semipaste containing 100 g of pigment (see 3 (/)), add 100 cc of kerosene, mix thoroughly, and wash with kerosene through the sieve, breaking up all lumps but not grinding. After washing with kerosene until all but the particles too coarse to pass. the sieve have been washed through, wash all kerosene from the sieve with ether or petroleum ether, heat the sieve...show more

Product details

  • Paperback | 222 pages
  • 189 x 246 x 12mm | 404g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236783387
  • 9781236783387