Proceedings of the Chemical Society Volume 9 (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. 1895 Excerpt: ...hydrogen peroxide. Experiments are described, showing that if peroxide of hydrogen be added to fresh urine, this may be kept during a considerable period in the dark without the peroxide being entirely decomposed, and that its presence renders the liquid much less prone to undergo change under the influence of organisms, while, if added to urine in which fermentative change has already set in, it is rapidly decomposed. 15. "The supposed saponification of linseed oil by Dutch white lead." By J. B. Hannay, F.R.S.E., and Arthur E. Leighton. Statements are quoted from technical writers showing the existence of a belief that white lead acts on the oil in which it is ground, and even indicating that the heat given out in mixing the pigment with oil is due to the occurrence of an interaction. The authors show that no heat is given out on mixing oil and white lead without undue friction, and that the heat obesred in manufacturing operations is due to the conversion of the energ5--mf the engine into heat by friction. Also that white lead can be freed from oil asreadi y as any other pigment if a sufficient quantity be used, but it Fsguires 100 c.c. to every gram of pigment to effect a complete separi-jon. Oleate of lead, whether basic, neutral or acid, is shown to be readily soluble in ether, and it was mixed with white lead, both dry and ground in oil, and then extracted with ether, thus proving that if present it would certainly dissolve in the ether used to extract the oil. The method of testing is described, and it is shown that by passing sulphuretted hydrogen through the ethereal solution of the oleate, the faintest trace of oleate can be detected. A series of tests carried out on samples of Dutch white lead produced by the most eminent...