By Ellis P Steinberg
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Extra resources for The radiochemistry of niobium and tantalum
It may be necessary to centrifuge for five to ten minutes at this point because the organic layer’ often exhibits emulsi~ication. Repeat the treatment twice with 2- ml portions of water. 6. icient cone. 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.
6, If the first portion of the filtrate Is not clear, retu,rn it to the filter. 41 procedure #8. (Preclpita”tlon method for Nb) A. S. Newton, USAEC Report UCRL-432 (Aug. 1949). s Procedure: 1. The Th metal Is dissolved In cone. 2 ~ NH4LIF6 solution to clear up the black residue. The HC1 Is diluted to 2 ~ and an allquot taken. mg Zr holdback carrier, Add an equal volume cone. HN03, 1 ml 6 ~ HC1, 1 ml saturated ~C204, carrier. 5 gm KBr03 In small portions digesting and bolllng a few Digest 5 minutes and centrl- minutes after each addltlon.
3 Repeat Steps 3, 4, 5, 6, and 7. 20 ml of CHC13. w“ Step 10. “ X~O ~205 Transfer the CHC1 Repeat Steps 8, 3, 4, 5, 6, and 7, but dissolve the precipitate formed in Step 7 in 5 ml of saturated (NH4)2C~H406 solution and sufficient cone. NH40H to make the solution alkaline. Step 11. Cool the solution in an ice bath and add 4 ml of cupferron reagent. Add 6 ~ HC1 dropwlse to acidify a methyl red end point). Filter the Nb-cupferron No. 42 Whatman filter circle, 7@ diameter, using (2 drops past complex onto a the ground-off Hirsch funnel and filter chimney equipment.
The radiochemistry of niobium and tantalum by Ellis P Steinberg