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
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