By Ellis P Steinberg
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Scherff and G. Hernnann, Z. Elektrochem. ~, E. BS11OU, Anal. Chem. ~~, 1022 (1960) 1602 (1953). (28) E. M. Scadden andN. (29) T. Ishlmorl, H. Umeeawa, and K. Watanabe, J. Atomic Energy Sot. Japan (30) ~, 299 (1959). C. J. Hardy andD. Scarglll, J. Inorg. and Nucl. Chem. 13, 174 (1960). (31) J. M. Fletcher, D. F. C. Morris, and A. G. Waln, Trans. Inst. Min. Metall. 62, 487 (1955); D. F. C. Morris, A. Waln, 55 and J. M. Fletcher, [32) . R:E. C/R 1391 (1954). G. W. Leddicote and F. L. Moore, J. Am.
Note 3). of 6YHN03, Heat nearly to Transfer to a crucible, burn off the filter paper, and Ignite In a muffle furnace at 800”C for about 15 min. Cool, weigh the crucible and Its contents, transfer the Ignited precipitate to the mounting card, and reWelgh the crucible to find the weimt of Nb205 mounted. Notes 1. The volume of the sample ehould not exceed 10 ml. 2. SIF~- or F- Is present, Nb205 will not precipitate. An excess of H=BO= added to the sample ellmlnatea this dlfflJA Culty . If’the orlglnal sample 10 turold or of doubtful com- posltlon, use step lb.
Lfi 39 (1955). A source of Nb was required containing no zirconium and as large a ratio as possible of Nbga to Nb95 . This was required In a solution containing less than ~ mg of total solid which Thus the Zr95 could be evaporated on a thin polystyrene foil. of niobium again before the short llved decay appreciably. exchange column, Isomer could This was achieved by the use ofan anion after two other separation procedures had been tried and rejected. First, a method of separation due to Fudge (A.