By Gregory R Choppin
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Centrifuge. Pour supernatant Into a clean centrifuge cone and discard La(OH)3 ppt. , cool to room temperature, and centrifuge. 1 M HC1 (see Note 2). (7) ::~lC& the ppt by adding 3 ml of 6 M HC1 and . Evaporate just to dryness. If the solution is not deep ruby red and clear before dryness Is approached, take nearly to dryness, add more 6 M HC1 and carefully evaporate again to dryness (see Notes 3 and 4). 1 M HC1 and transfer to a Dowex-1 anion column. (cl form, water washed, 50-100 mesh, x-8 in a ia.
Thl~ was the only detectable ImpuFity. &y: “1 Cone” b) while fuming add 2-3 drops H P02, continue fuming for 30 min. (see Note3No. 1). a) Cool, dilute to ~20 ml, add 5 ml NaBr03, boil for 10 min. 1 cone. HC1’,continue boiling 10 tin. , centrifuge, filter supernatant Into 125 ml Erlerrmeyerflask. (4) a) Add N5 ml 5 ~ NaI, 2 ml H SO , boil to coagulate RhI ppt, transfer $0 10 ml cone, centrlfug~. b) wash a) Add to ppt, 2 ml cone. O #bout 1 ml or less volume. b) Ice cool, add 5 ml cone. HCI carefully, pass thru Dowex A-1 column preconditioned with cone.
Harwell, to b,e published. 55-6og Separation Time: 2 hours Decontamination: At leaat 106 from Zr. Cs, Te. and Sb. Also. Ru waa removed wlthl~2-~ mlnutea of the end of the irradiation. - Procedure: (1) Add the irradiated solution to 3 ml of 70% perchlorlc acid containing 10 mg Rhodium, 5 w of Ruthenium ~d 3 w of Zr as carriers. finally reducing the volume to 1 ❑l. 60% sodium nitrate solution. Heat to form the rhodonitrite complex, then add 12 M NaOH until a pH of 9 la reached. At this stage plutonium (or uranium) and zirconium are precipitated.