By Ellis P Steinberg
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Extra resources for The radiochemistry of niobium and tantalum
Sample text
NH40H to make the solution barely alkaline. If necessary, “back-titrateVq by dropwise addition of 4 —N HNO s to a faint pink. Centrifuge the Pesultant pre- cipita’ce and wash once with 5 ml cone, HNO of a or with 5 ml 3 solution of 1 ~, NH40H nearly saturated with NH4N03, 7’ Repeat the cycle (steps 2 through 6) 8. Wash the final precipitate with 5 ml acetone. wash. twice. Discard the With vigorous stirring motion of a platinum wire In the precipitate, place Vne cone in a boiling water bath and continue stirring unti’1 the precipitate appeaps dry and the acetone has evaporated from the cone.
Huffman, G. N. Iddings, and R. c. Lilly, J. fun, Chem. Sot. ~’, 4474 (1951). (42) J. L. Hague, E. D. Brown, and H. A. Bright, J. Res, Nat. Bur. Stds. 53/4, 261 (1954). --— (43) 15/3, 63 J. , Meded. vlaansche them. Ver. —-(1953) . (44) E. R. Tompkins, J. X. Khym, and W. E. Cohn, J. Am. Chem. SOC. (45) ~~, 2769 (1947). W. E. Cohn, G. W. Parker, and E. R. Tompldns, Nuclebnics ~. No. 5, 22 (1948). (46) J. A. Ayres, J. Am. Chem. Sot. ~~, 2879 (1947). 56 (47) J. Schubert, J. Phya& Colloid Chem. ~~, 34o (1948); J.
Waiih the precipitate by stlrrlng up In 3 ml of 6 ~NH40H, 1 ml”or 6~ IiN03, and 5 ml of ~0, Repeat the waah- and centrifuge (Note 4). ualng the waah solutlon to t=na~er the precipitate to a 50-ml glass centrifuge “tube. Heat nearly to bolllng and centriAdd about 10 drops of 6 ~ HlJ03 to the precipitate and,pro- fuge. a5). ~0 40 and 5 ml Procedure 7 (Continued) of cone. HN03, and heat nearly to bolllng. 5 g of KC103 In Bmall portions, boil for a few seconds after each addltlon, Wash the Nb205 In a mixture of 3ml and centrifuge.