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. 1917 edition. Excerpt: ...by nitric acid. The nitric acid is expelled by evaporation to dryness, followed by a second evaporation with hydrochloric acid, which dehydrates the silica. Iron is now reduced to the ferrous condition and the silica and residue, undissolved by addition of hot water and HC1, is filtered off. The ...
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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. 1917 edition. Excerpt: ...by nitric acid. The nitric acid is expelled by evaporation to dryness, followed by a second evaporation with hydrochloric acid, which dehydrates the silica. Iron is now reduced to the ferrous condition and the silica and residue, undissolved by addition of hot water and HC1, is filtered off. The sulphur is precipitated in a large volume of cold solution, by barium chloride solution, as BaS04 and so weighed. Reagents. Bromine--Potassium Bromide Solution. 320 grams of potassium bromide are dissolved in just sufficient water to cause solution and mixed with 200 cc. of bromine, the bromine being poured into the saturated bromide solution. After mixing well the solution is diluted to 2000 cc. Bromine--Carbon Tetrachloride Solution. Carbon tetrachloride saturated with bromine. Barium Chloride, anhydrous, 5% solution; or crystals, 6% solution. Procedure. Preparation of Sample. The sample ground to pass 80-mesh sieve is carefully mixed and quartered down to 10 grams. This is dried for one hour at 100 C. and then placed in a weighing tube. A factor weight, 1.3738 grams of the sample, is placed in a deep beaker, 300 cc. capacity, 2 by 4j ins. Oxidation of Sulphur. Ten cc. of the bromine-potassium bromide mixture for pyrrhotite ore, or bromine--carbon tetrachloride reagent for pyrites ores, are added and the beaker covered with a dry watch-glass cover. After standing 1 Paper before Eighth International Congress of Applied Chemistry: "An Exact Method for the Determination of Sulphur in Pyrites Ores," V. S. Allen and H. B. Bishop. Watch Gloss Cover. Glass Rider Fig. 60. fifteen minutes in the cold bath (a casserole of water will do), with occasional shaking of the beaker, 15 cc. of strong nitric acid are added and the mixture allowed to...
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All Editions of Standard Methods of Chemical Analysis: A Manual of Analytical Methods and General Reference for the Analytical Chemist and for the Advanced Student
