For these limitel number of samples, the results show that
the 6 normal hydrochloric acid extraction, removes upwards of 84% of
the total strontium-90.
Bryant et al in Englend have shown good agree-
ment also between soil fusion and HCl extraction, (14)
209
Stable Strontium
By using the strontiumm-85 tracer and the weight of the
strontium found at the end of the procedure, a reasonably good estimate
can be made of the stable strontium extracted by the 6w Hc1."22) tt is
extremely important, however, that a sufficient number of fuming nitric
acid separations be employed to completely separate strontium from celcium.
Some analyses of stable strontium in soil using this method ere
reported in Table 6.
A mean reproducibility of 11% was found for a large
range of values.
2.10
Calcium-Strontium Separation
A test of calcium-strontium separation efficiency with 75%
i
nitric acid using Ca¥ as tracer showed ealcium contamination of less
than 0.2 mg in the strontium fraction.
The initial Ca to Sr ratio used
was 100 to i (2 gms. Ca against 20 mg Sr).
(11)
Bryant, F. J., Chamberlain, A. C., Morgan, A., Spicer, G. S.,
“Radiostrontium Fallout in Biological Materials in Britian”,
AERE HP/R 2056.
mz stable &r
in sample.
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