TN ee ent eee
ww wee
consistently higher chemical yields resulted for both the plutonium and
uranium procedures.
A synopsis ef the final analytical procedure used for
--+h olutonium and uranium is shown as follows:
Chemical Procedures for the Separation and rlatina of
Plutonium, Urantum and Neptunium from Coralline Sedirents.
1.
An aliquot of the dissolved sample is spiked with a known
quantity of 242 oy or 2364 or 2324 and boiled to near dryness.
ANION EXCHANGE PROCEDURE
2. (Plutonium)
The residue is dissolved in a minimum amount of
8M HNO3 (with heat).
After cooling, about 100 mg of solid
NaNO» is added in small portions.
The sample is allowed to
TR meegree One erpe meena
sree
stand for 15 minutes before being slowly warmed to remove
the excess NQo.
(Uranium)
The residue is converted to chlorides by evaporation
to near dryness twice with conc. HCL and then dissolved in a
minimum volume of 7 MHCL.
The solution is passed through a anion-exchange column in
which the resin (Bio-Rad Laboratories AG 1-X8, 100-200 mesh)
has been converted to either the nitrate form (for plutonium)
or the chloride form (for uranium) with 8 Macids.
The salts are washed through the column with 225 ml of 8 M HNO3
(if plutonium) or 9 M HCL (if uranium).
. The resin is further washed with 115 ml of 8 MHCL before
plutonium is elated with 150 ml of 0.4 M HCL, containing ,01 MHF.
Uranium is elated with 150 ml of 1 M HCL without an intermediate
wash step.
. The solution containing the dissolved transuranics is evaporated
to near dryness and wet-ashed with concentrated HCLO, - HNO.
TIOA EXTRACTION PROCEDURE
7. The residue is converted to chlorides by evaporation of two 10-ml
additions of concentrated HCL.
After the last evaporation of HCL,
the residue is dissolved in 50 ml of 8 MHCL.