Abstract
A small amount of strontium ion (20 mg) was simply separated from a large amount of calcium ion (0.5 to 13.6 g) by liquid--liquid extraction using dicyclohexyl 18-crown-6 chloroform solution. The extraction was applied to a part of the procedure for determining radiostrontium in ash of milk. The overall recovery of strontium was 75% on the average for 5 to 10 g of milk ash. Decontamination factors for Mg, Ca, Ru, I, Cs, Ba, and La in the final fraction were 1 x 10/sup 5/, 1 x 10/sup 4/, > 1 x 10/sup 6/, > 1 x 10/sup 6/, > 2 x 10/sup 6/, 2 x 10/sup 5/, and 3 x 10/sup 4/, respectively. The chemical procedure for three samples took about 2 days. 1 figure, 3 tables.
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