SODTmM © G. Fulmer and 3. Intorre A.6 INTRODUCTION The sodium is separsted from the fission products by eluting the sample. from a column of collotdal Dowex-~50 cation resin. The sodium fraction of this elution contains some anions which can be removed by a subsequent elution of this fraction from an anion column of Nalcite SAR resin. The sodium fraction from the anion elution is finally Slurried with fine mesh Dowex-50 to adsorb all the sodium present. The aug resin is then filtered on Whatman $50 paper and mounted for counting, This separation was a 190 per cent chemical yield. A.7 REAGENTS Colloidal Dowex-50 cation resin Dowex-50, cation, resin, below 400 mesh Nalcite SAR resin, 20-50 mesh HCl 0.5 N A.8 PROCED 1. Prepare a glass column, if mm inside diameter, with glass wool plugging the restricted lower end. This column is filled with ‘colloidal Dowex-50 resin slurried in 6.5N HCl to a settled bed height of 11 + 0,5 cm.. Any excess resin in the column is removed by slurring the resin with additional 0.5 NHC] and drawing the excess from the top of the column with a syringe. Then the column is conditioned by washing with 10 mi of 3 N NaCl followed by 100 ml of 0.5 N HCl. This cycle is repeated three times (Note 1). 2. A sample containing not more than 15 mg of NaCl (usually 1 to 2 m1) is added to the column: after the 0.5N HCl has drained to the top of the resin bed. Care 18 taken to add the sample directly to the top layer of the resin without contacting the sides of the column. After the semple has drained to the top of the resin, sufficient 0.5N HCl is carefully pipetted onto the resin to prevent slurrying when the 0.5 N HCl reservoir is connected. 3. After the 0.5N HCl reservoir has been connected, the elution flow rate should be aprroximately 1.5 ml/min (note 2). a temeiy ‘y ml of eluate are discerded. ' along with sore anions such as molybdate, ruthenate, and, lodate, are collected for addition to an anion column. m a diatlattinesaie 49 be; ‘The-first 30 The next 40 ml, which contain the scdium SECRET — RESTRICTED DATA