Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
The Spectrophotometric Determination of Uranium with Xylenol Orange
Makoto Otomo
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1963 Volume 36 Issue 2 Pages 140-142


A new spectrophotometric method for determining trace amounts of uranium has been developed. This method is based on the coloration of xylenol orange with uranium (IV) formed by the reduction of uranium(VI) in the presence of ascorbic acid. The effects of the pH value, reagent and boiling time have been thoroughly investigated, and experimental conditions which make possible the determination of 20 to 100 μg. of uranium have been devised. The mole ratio of the complex between uranium and this reagent has also been discussed.

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