ISSN:
1618-2650
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Summary 1. A new volumetric method for the estimation of uranium VI has now been developed. The method consists in exposing the uranium VI solution in 1.0 to 3.0 N sulphuric acid solution with an excess of ethanol in a glass vessel to sunlight or the light from a Philip's Repro lamp for 30 to 60 minutes. The uranium IV salt formed is estimated by titration with a standard solution of sodium vanadate. 2. The photochemical reduction method now proposed is not subject to the disadvantages of reduction by Jones Reductor or the Silver Reductor. The reduction does not proceed to the uranium III state under any conditions of exposure. Moreover, the photochemical reduction is carried out easily and rapidly, without the need for any equipment or special precautions. 3. Phosphate, arsenate, perchlorate, fluoride and citrate ions do not interfere in the proposed method. Chloride, bromide and iodide markedly retard the photo-reduction of uranium VI to uranium IV. Oxalate slightly retards the reactions. 4. Iron III, Molybdenum VI, Tungsten VI, Vanadium V are also reduced by alcohol in light to FeII, MoV, WV and VIV. Stannic tin is not reduced. Chromates are reduced only to Cr III and not Cr II as in the Jones reductor. Vanadium V, although reduced to Vanadium IV, does not interfere in the estimation because our method uses sodium vanadate as the titrant and this has no action on vanadium IV. It will be thus evident that the number of interefering metals and acid radicles is very much reduced in the photochemical method than in the Jones Reductor or the Silver Reductor.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00457729
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