-_.
_
UNCLASSIFIED
AMALTTICAL PROCEDURE FOR THE SEPARATION OF TOTAL
RADTOSTRONTIOM FROM A 300 SRAM SAMPLE OF SOTL
le
Dry the entire sample in an oven at 120°C.
ae
Sample, using standard sampling procedure (quartering prodess)
until approximately 125 grams cf soil is cbtained as a repre
sentative sample.
3. Ignite in # nickel crucible at 900°C.
bbe
-
o0
6.
Weigh out 100 grams of the ignited material.
Add LOO grams of Na,CO, and mix thoroughly.
Fuse in a muffle at-900°C (minizsum temperature) for 45 mihutes,
(minimus time) until the melt ia clear and homogeneous.
Cool by immersing in a beaker of cold water, withdrawing quickly
at first. Continue immersing and withdrswing until the
is cool enough to place on a transite board. The NagC03 Ishould
not be wet at any tine.
-
a.
+
9.
f
Wo.
automatic grinder and grind to a fine powder.
Transfer the ground fused meterial to a j-liter beaker
ing 300 wl of hot distilled water, stirring constantly
the particles are dispersed.
Add slowly with continued stirring, 1000 ml of 60% 1
is sufficient to neutralize the fused material and all
excess of acid.
,
2.
Evaporate with mechanical stirring until dense white
are detected.
The silica is now dehydrated.
rt
13. Dilute to 2.5 liters with distilled water and allow to
e
ib.
oF
5
«
.
-~
wit
a
i
Filter the silica on No. 5 Whatman paper with suction.
With 29-300 ml of hot 5% BC1, then with 250 ml of dis
water. Transfer the filtrate and washings to the criggnl
beaker. Wash the silica with 1% H33Q,, and discard th
mie Sf
UNCLASSIFTED
00131986 050
[05131079
TY?