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Download Bulletin Volume 152-159

Download Bulletin Volume 152-159

Bulletin Volume 152-159. United States Bureau of Chemistry

Bulletin Volume 152-159
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Author: United States Bureau of Chemistry
Page Count: 190 pages
Published Date: 01 May 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781231221365
File Name: Bulletin.Volume.152-159.pdf
Download Link: Bulletin Volume 152-159
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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. 1912 Excerpt: ...the latter method. MOISTURE CONTENT OF SUOAB6. An attempt was made to compare the ordinary method of determining the moisture content of sugar by drying with a refractometric method, in which the raw sugar was dissolved in its own weight of water aild the refractive index of the solution taken. The results of the work, however, were so various that 11 am aware of the rider on page 65, Bulletin 107, Revised, to the effect that the aerometric method does not apply to "Jow-grade products," but all of the samples in Table 4, except E, are technically "high grade" products. no conclusions whatever could be drawn therefrom, so that the question must be left over to another year. Table 6.--Hoisture in raw sugars. POLARIZATION. The work of last year showed that the use of Home's dry lead subacetate as a clarifying agent gave results almost identical with those obtained with lead subacetate solution. This question was further investigated this year and the results are given in Table 7. Table 7.--Polarization results using normal quantity of clarifying agents. These results confirm those of previous years, showing that, properly employed, the Home's dry-lead method gives results'practieally identical with those of the standard method. In previous years the proposal has been made that the dry-lead method should be made the sole official one, as it has the advantage of eliminating the error due to the lead precipitate. While the evidence would seem to show that this step is justified, the writer feels that as it is against or, shall we say in advance of, almost all home and foreign practice, very careful consideration should be given to the matter before the recommendation Is adopted. The work on the polarization of molasses by methods 3 and 3a was ...

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