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By H. N. Wilson

ISBN-10: 0080115438

ISBN-13: 9780080115436

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10. 11. 12. Butterworth, London (for International Union of Pure and Applied Chemistry), 1964. W I L S O N , H . N. and H U G H E S , W . C , J. Soc. Chem. , 5 8 , 74 (1939). , Ind. Chim. Belge, 2 3 ( 2 ) , 115 (1958). S U L L Y , Β .

Perhaps the most versatile is the bromine reagent of Dubois and Skoog, discussed below under the petroleum industry. * The acetyl value. g. castor oil. They can be acetylated by acetic anhydride. 3 cSco)" 0+ C 3 5[° i H C H MO . O H ] , = C 3 H 5 [ O C 1 , H 3 2 O . C H 3 C O ] 3 + 3CH 3COOH ORGANIC ANALYSIS 45 The oil is boiled with excess acetic anhydride, and excess reagent removed by washing with water. 5 g of the acetylated product was saponified with potassium hydroxide, the solution acidified with sulphuric acid, and the regenerated acetic acid distilled and titrated.

Brunck first described the quantitative use of this " outstanding reagent ", and incidentally he noted that the presence of more than 100 mg of cobalt prevented complete precipitation. This reagent is much more selective than the nitrosonaphthols, in fact it approaches specificity, because although it combines with 11 copper, cobalt , zinc and ferrous iron, the compounds are not insoluble; thus more reagent is necessary when these elements are present. Ferric iron must be masked by citric acid.

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An Approach to Chemical Analysis. Its Development and Practice by H. N. Wilson


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