Proceedings of the Annual Meeting Volume 7 (Paperback)

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. 1885 Excerpt: ... cannot be recommended in preparing emulsions, and with the field still open for further investigation, I remain, Respectfully, John Rauschkolb, Columbus, O. IODUM. MISS MARY H. SPENZER, Cleveland, O. Query No. 6.--An examination of Commercial Iodine is wanted. For the above Query, eleven samples of resublimed Iodine of commerce, labeled "G. Mallinckrodt & Co.," "Chas. Pfizer," "Powers & Weightman" and "Billings, Clapp & Co.," were subjected to the following tests: i. Appearance. 2. Odor. 3. Volatilization. 4. Solution in its Several Solvents--Water, Ether, Chloroform, etc. 5. Detection of Chlorine and Bromine. 6. Detection of Cyanide of Iodine. 7. Detection of Calcium Salts. 8. Estimation of Iodine. 9. Estimation of Water. 1. Appearance.--Several substances can be detected by this means: (a) Water, by the sticky coherence of the Iodine together or to the side of the bottle. (b) Non-volatile adulterations, such as coal, black antimony, etc., can be inferred. (c) By the aid of a magnifying glass, minute, colorless, needle-shaped crystals of Cyanide of Iodine can be detected. 2. Odor.--Iodine has not a very strong odor, therefore the very disagreeable odor of Cyanide of Iodine can be observed if present. 3. Volatilization.--Pure Iodine should completely volatilize, leaving no residue when heated in a test tube; if otherwise, it is adulterated; Cyanide of Iodine, if present, will be seen sublimed as colorless crystals above the Iodine. 4. Solution in its Several Solvents.--(a) The solution, in water, should be of a yellowish-brown color; while if Chloride of Iodine is present, the solution is much darker. (b) Ether and Water.--Pure Iodine should make a perfect solution in Ether; on the addition of water, if i...