Investigations into the analytical chemistry of tantalum, niobium, and their mineral associates. XXIX. The separation of tungsten from titanium, niobium, tantalum, and zirconium

Some New Isotopes of Antimony and Tin

“…To decrease the chemical separation time and to get a sample containing much less carrier, a fraction of the tantalum activity was adsorbed from a basic solution of Na2W04 on insoluble sodium tantalate. 2 DufBeld et al* identified the 48-min activity as Ta 185 from its preparation by a (7, p) reaction on separated W 186 isotope, confirming Butement's tentative assignment. 4 Coincidence counting experiments showed that the soft and hard electron components of approximately equal intensity were not emitted within a delay period of less than 10 /-tsec.…”

“…Similarly the increases in the Sn m /Mo 99 , Sn 125 /Mo 99 , Sb m /Mo 99 , and I 131 /Mo 99 activity ratios are 100, 75, 20.5, and 1.65, respectively. 2 The increase in the 9-hr Sb/Mo 99 activity ratio in going from thermal to 14-Mev fission was 38. Since this increase lies between that observed for Sn 126 and that observed for Sb 127 , we conclude that the 9-hr Sb should be assigned to mass 126.…”

Determination of Niobium and Tantalum in Minerals, Ores and Concentrates Using Ion Exchange.

“…Most methods represented modifications of the original Schoeller procedure (28, SO, SI, 36), which is based on a preliminary collection of the combined oxides of niobium, tantalum, titanium, zirconium possibly contaminated by tungsten and phosphorus. After removal of titanium (29) and tungsten (25), the now classical tannin procedure is carried out (27).…”