The Analyst Volume 31.cRoyal Society Of Chemistry
The Analyst Volume 31
Author: Royal Society Of Chemistry
Number of Pages: 218 pages
Published Date: 01 Mar 2012
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781130471588
File Name: The.Analyst.Volume.31.pdf
Download Link: The Analyst Volume 31

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. 1907 Excerpt: ... rule, very little of the oxidation product of propyl alcohol. He thought, therefore, that very small proportions of propyl alcohol were extracted in this method, and if that alcohol was to be included under the heading of " higher alcohols " it seemed quite possible that the results hitherto obtained were not by any means accurate. He thought that the great importance of the authors' two communications on this subject lay in the fact that they had gone far to establish the superiority of the Allen-Marquardt method over the others they had investigated. The surface-tension methods, the Beckmann method, the colorimetric method, and the Rose-Herzfeld method had all been, or were being, severely discredited, and whatever errors might be inherent in the Allen-Marquardt process, it was at least based on scientific principles, and gave results which in the hands of different observers were capable of being compared. Dr. Schidrowitz, in reply, said that he was inclined to agree with Mr. Chapman that the examination of propyl alcohol would indicate that some of the results obtained in the past were not quite accurate. He agreed with Dr. Hewitt that the end-point in the titration with methyl orange had been a source of difficulty. At the same time he thought it might be well to continue to do it roughly, to see whether the ratio they had mentioned existed. In cases in which the ratio was found to be abnormal, a gravimetric estimation of chlorine should be carried out. This, however, would in practice only very rarely be necessary. The utility of the colorimetric method even as an index of quality was, he thought, very fallacious. He had known whiskies of the same class to show enormous differences by the colorimetric method, while there was little differen...

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