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- W1576749368 abstract "A method is described for the determination of vanadium and molybdenum in minerals that contain uranium. After the acid or alkaline decomposition of the sample, the vanadium is first separated in the 6M hydrochloric acid decomposing solution from the molybdenum, iron, and uranium by employment of the strongly basic anion exchanger Dowex 1-X8 by elution with 6M hydrochloric acid and determined then in the evaporation residue of the eluate spectrophotometrically by means of a modified form of the phosphotungstic acid method. Thereupon the molybdenum which was adsorbed on the anion exchanger is selectively eluted with a mixture of 90 vol.% methanol and 10 vol.% hydrochloric acid and after evaporation of the eluate is determined spectrophotometrically by the thiocyanate method. The organic substances that originate in the exchange resln and are now present in the vanadium or molybdenum eluates, and which interfere in the spectrophotometric determinations of these elements, are decomposed oxidatively by means of aqua regia or concentrated nitric acid and thus rendered harmless. The findings obtained from analysis of ten minerals containing uranium exhibit excellent agreement. (auth)" @default.
- W1576749368 created "2016-06-24" @default.
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- W1576749368 date "1973-01-01" @default.
- W1576749368 modified "2023-09-26" @default.
- W1576749368 title "Contributions to the analysis of nuclear raw materials. IV" @default.
- W1576749368 hasPublicationYear "1973" @default.
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