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. (1D) Sr Pound sicla = (-~) mg Sr added. i ere S we ~ as "=, a es, “ay. . ~ ~ & a oo ao sey, x . . . SSR RNAS aor [orem or mae £ t SA < _ “oy = sO ~ . Bey. AR wees e Ry ™~ = > ASN egy POR RS eSPeas ee Feoe. oo ee eaa AA = a ee an SAE Se Pe” ~~ - oe mS. ms, . = oF » a . * “Nero -. . OSS aT : ~ : 6 => . 4 4 S RR as. = ~ ORAL . ye A LAR ‘ MERE mercer ne sperReeer ies erp renzo