epeget a OR ae FT eth ne UNCLASSIFIED. 4%, The anion column fs composed of Nalcite S42 resin, 20-50 mesh, and measures 52 em in length and 11 mm inside diameter. It is con- ditione?d prior to use by washing with 50 ml of 10 per cent NaOH followed by 300 to 500 ml of H30. The fraction collected in step 3 is added to the anion column in aliquots of 10 ml, permitting the column to drain to the top of the resin bed after each adijition (Note 4). The container used to collect the fraction is washed with 2 ml portions of Hj0, and the washings are added to the column. 5. A distilled 420 reservoir is connected to the anion column and a flow rate of 1.0 to 1.5 ml/min is maintained. of eluate are discarded. collected. The first 15 ml The next 79 ml containing the sodium are 6. The 70 ml fraction 4s transferred to a beaker which contains 70 mg of fine mesh Dowex-50 (not colloidal). The slurry is stirred interrittently for 20 to 30 minutes to adsorb all the sodium on the resin. 7. The resin is filtered on Whatman #50 peper, washed with 10 ml of ethanol and 10 ml of ether, anc sucked dry on a vacuum line. The resin is then mounted onan alumimimplate for counting (Note 5). , \ -- A.9 NOTES 1. Conditioning may be carried out using large batches of resin rather than treating the analytical columns separately, 2. The flow rate was initially restricted to 0.5 ml/min but the increase to 1.5 ml/min had no adverse effects. 3. Prior to making up the anion column, the resin can be slurried with a dilute solution of phenolphthalein. The phenolphthalein is absorbed on the resin and indicates when the resin 15 in the hydroxide form. 4%, <A much better practice is to boil the cation fraction down to a few ml before addition to the anion column. 5. The chemical yield 4s 100 per cent, UNCLASSIEIED. °