Methods of Analysis and Laboratory Control of the Great Western Sugar Company |
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Other editions - View all
Methods of Analysis and Laboratory Control of the Great Western Sugar Company Great Western Sugar Company No preview available - 2023 |
Methods of Analysis and Laboratory Control of the Great Western Sugar Company Great Western Sugar Company No preview available - 2017 |
Common terms and phrases
Alkalinity aluminum ammonium hydroxide amount ANALYSIS apparatus Apparent Purity average sample barium chloride beaker beet boiling bottle Brix or Baumé bromine burette calcium carbon dioxide catch sample coal composite sample cool cooler cossettes crucible Cubic Degrees Degrees Specific Degrees Specific Brix described in Chap digestion dilute dish Dissolve distilled drop dry substance Evaporate excess filter filtrate flue gas glass grams Gravity heat hot water hydrochloric acid hydrometer ignite inch juice laboratory lead acetate Methods ml flask ml of water moisture molasses Multiply nitric acid number of ml obtain the percentage oven oxide percentage of sugar phenolphthalein pipette platinum polariscope polarization portion potash potassium Pounds Dry Sub precipitate pulp Raffinose reading REAGENTS rinse Saccharate Cake SAMPLING Take silver nitrate soap solution sodium carbonate sodium hydroxide stopper Sugar Modulus sulphate sulphide sulphuric acid TABLE Take a catch temperature thermometer tion titrate tube Waste Water water bath weigh
Popular passages
Page 164 - ... 0.002 millimeter diameter. Small beakers and small quantities of distilled water are used at first for the decantations, as thus the duration of subsidence is less and more decantations can be made in a given time than when larger quantities of water are employed. Beakers of about 100 cubic centimeters capacity are convenient for the coarser grades, but it is necessary to use larger vessels for the fine sediments from which turbid water accumulates that cannot be thrown away, as may be done with...
Page 155 - Place the flask in an inclined position and heat below the boiling point of the acid until frothing has ceased. (A small piece of paraffin may be added to prevent...
Page 154 - Potassium sulphide removes all mercury from solution and so prevents the formation of mercuro-ammonium compounds which are not completely decomposed by soda solution. The addition of zinc gives rise to an evolution of hydrogen and prevents violent bumping. Previous to use the reagents should be tested by a blank experiment with sugar, which will partially reduce any nitrates that are present which might otherwise escape notice.
Page 153 - The use of mercuric oxid in this operation greatly shortens the time necessary for digestion, which is rarely over an hour and a half in case of substances most difficult to oxidize, and is more commonly less than an hour. In most instances the use of potassium permanganate is quite unnecessary, but it is believed that in exceptional cases it is required for complete oxidation, and in view of the uncertainty it is always used.
Page 95 - ... solution until no further precipitation occurs. Continue the boiling for about 5 minutes ; allow to stand for 5 hours or longer in a warm place, pour the...
Page 117 - Titrate at once with the thiosulphate solution until the brown tinge has become weak, then add sufficient starch indicator to produce a marked blue coloration. Continue the titration cautiously until the color due to free iodine has entirely vanished. The blue color changes toward the end to a faint lilac. If at this point the...
Page 112 - ... of water. Keep the mixture in a warm place for several days, or until a portion heated to 40" C. deposits no yellow precipitate of ammonium phosphomolybdate. Decant the solution from any sediment and preserve in glass-stoppered vessels.
Page 165 - ... the siftings, is made in five or six hours, exclusive of the time necessary for collecting the dust and separating the clay, for which a subsidence of 24 hours is allowed. Weighing the Sediments. — The sediments are prepared for weighing by allowing them to subside completely, decanting the clear water as far as possible, rinsing them into a weighed platinum dish and igniting. The dish is cooled in a desiccator, and the ignited sediments are generally very hygroscopic. Effect of Boiling. —...
Page 112 - Dissolve 22 grams of recently ignited calcined magnesia in dilute hydrochloric acid, avoiding excess of the latter. Add a little calcined magnesia in excess, and boil a few minutes to precipitate iron, alumina, and phosphoric acid, filter, add 280 grams of ammonium chloride, 700 cc of ammonia of specific gravity 0.96, and water enough to make the volume of two liters.
Page 158 - NaOH solution (750 g/dm3), pouring it carefully down the side of the flask so that it does not mix immediately with the acid solution. Add...