Titrimetric determination of uranium in low-grade ores by the ferrous ion-phosphoric acid reduction method.
The modification and extension of the U.S.A.E.C. ferrous ion-phosphoric acid reduction method for the determination of uranium in high-grade or relatively pure material to a method for the determination of uranium with a high accuracy and precision, in ores containing 0.004-7% U is described. It is simple, rapid and requires no prior separations from elements that, in other methods, frequently interfere. For sample materials having very high concentrations of interfering elements, a prior concentration step using extraction with tri-n-octylphosphine oxide is described, but it is shown that, for most low-grade ores, this step is unnecessary.
Hitchen
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Special Analysis Section, CANMET, 555 Booth St., Ottawa, Canada.
Zechanowitsch
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G