Societies and Academies


    LONDON Society of Public Analysts, April 4. GUY BARB and A. L. THOBOGOOD: Determination of small quantities of fluorides in water. The reagent consists of an aqueous solution of zirconium oxychloride and sodium alizarin monosulphate. The test is sensitive for 0-1 part of fluorine for concentrations up to 5 parts per million. A. W. MIDDLETON: A test for ethylene glycol and its application in the presence of glycerol. The test is based upon the oxidation of glycol to oxalic acid by means of nitric acid, whilst under the same conditions glycerol yields aldehydic substances. Glycerol does not interfere unless present to the extent of more than 75 per cent of the mixed alcohols, and the test is sensitive to 0-1 gm. of glycol in 10 ml. of aqueous solution. W. MATHBB and W. J. SHANKS. Detection of diamines in leather. Tests are described whereby extremely small quantities of para- and meta-diamines can be detected in dyed and finished leathers. These diamines can be extracted from leather in the cold by means of N/10 hydrochloric acid or 1 per cent acetic acid, and that precipitation of the extracted tannins with lead acetate does not interfere with the subsequent tests for diamines. The reagents used include 0-1 per cent solutions of dimethyl-£>-phenylene diamine, dimethyl-aniline, aniline, o-toluidine, #>-phenylene diamine, and m-toluylene diamine.

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