Spectrophotometric microdetermination of bromine in organic halogenocompounds
Organic elemental microanalysis by colorimetric method. IV
1979 Volume 28 Issue 2 Pages 121-123
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1979 Volume 28 Issue 2 Pages 121-123
A simple spectrophotometric method for the microdetermination of bromine in organic halogenocompounds has been proposed. A sample containing bromine is burnt in a flask filled with oxygen, and the gas formed is absorbed in a definite volume of water. The solution is heated to nearly boiling and then cooled with tap water. An aliquot of the solution is taken in a separatory funnel, and mixed with a sulfuric acid and a potassium permanganate solution, whereby bromide in the solution is quantitatively oxidized to bromine, which can be extracted with carbon tetrachloride. To the organic phase are added water, ferric ammonium sulfate-nitric acid solution and methanolic mercuric thiocyanate solution. The mixture is then shaken vigorously for 1 min. The absorbance of colored aqueous phase is measured at 460 nm against distilled water. According to the present method the bromine ranging from 3.75 to 62.50% in organic halogenocompounds can be determined with a reasonably high accuracy of ±0.3%, comparable with those attainable usually in organic elementary microanalysis. Chlorine and iodine do not interfere with the determination of bromine.
