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- W290031607 abstract "A gravimetric method was developed for the quantitative determination of Nb and Ta by cyclohexanone extraction from aqueous solutions containing 400 g/l H/ sub 2/SO/sub 4/, 200 g/l (NH/sub 4/)/sub 2/SO/sub 4/, and 100 g/l HF with subsequent back extraction of Nb from the organic phase by an aqueous solution containing 100 g/l H/sub 2/SO/sub 4/ and 50 g/l (NH/sub 2/)/sub 4/SO/su b 4/. By means of the method developed Nb and Ta may be determined in various materials containing more than 0.5 to 1.0% of pentoxides. Determination is hindered by P if the amount of P/sub 2/O/sub 5/ in the weighed portion of the original material exceeds 50 mg. The method is characterized by its universality and relative rapidity. (auth)" @default.
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- W290031607 date "1963-06-01" @default.
- W290031607 modified "2023-09-28" @default.
- W290031607 title "A GRAVIMETRIC METHOD FOR THE QUANTITATIVE DETERMINATION OF COLUMBIUM AND TANTALUM BY CYCLOHEXANONE EXTRACTION" @default.
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