. The Alumni journal. Columbia University. College of Pharmacy; Pharmacology. THE ALUMNI JOURNAL 137 - The method.—In the method finally devised, oxidation is made with a weak solution of chromic acid, free from sul])huric acid. The acid is mixed with a small volume of the sample and the liquid at once distilled. The distillate is tested for formaldehyde. It was thought that an air condenser which coiild be readily de- tached for cleaning could be employed. The kind, represented in the figure, has served this purpose admirably. In distillation it is held in position by means of a wooden test t
. The Alumni journal. Columbia University. College of Pharmacy; Pharmacology. THE ALUMNI JOURNAL 137 - The method.—In the method finally devised, oxidation is made with a weak solution of chromic acid, free from sul])huric acid. The acid is mixed with a small volume of the sample and the liquid at once distilled. The distillate is tested for formaldehyde. It was thought that an air condenser which coiild be readily de- tached for cleaning could be employed. The kind, represented in the figure, has served this purpose admirably. In distillation it is held in position by means of a wooden test tube holder secured in a small metal gSSI An air condenser. The nearly horizontal sections are 16 ins. to 18 ins. long; the middle, 14 ins.; tubing ^ in. Of the numerous tests for formaldehyde, the modified Hehner's test was selected, and when used as here directed, gave complete satisfaction. Liquids containing other substances should, of course, be distilled direct or after a dilution with water. By using another air condenser, this distillation is performed with expedition, only 5 to 15 drops of the distillate being required. Reagents needed.—Chrouiic acid solution, in distilled water, con- taining per cent, of CrO,, free from sulphuric acid. Albumin solution.—The white of one fresh egg is mixed with 50 of dis- tilled water, filtered, and preserved with a few drops of chloroform. Less sensitive on long keeping. Aldehyde-free milk answers nearly as well. Ferric chloride solution, containing per cent, of ferric chloride corresponding to per cent, of iron. Sulphuric acid, pure,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Columbia University. College of Pharmacy. Alumni Association. [New York] : Alumni Association, College of Pharmacy of the City of New York, Pharmaceutical
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Keywords: ., bookcollectionbiodiversit, booksubjectpharmacology, bookyear1913
