Abstract
An improved procedure is described for the determination of Sr/sup 90/ in milk by ion exchange. The procedure consists of storing the milk samples with formaldehyde preservative for the ingrowth of the Y/sup 90/ daughter of Sr/sup 90/ , adding Y carrier, and then passing the milk consecutively through cation and anion exchange resin columns. The alkaline earth ions in milk are replaced by sodium ions in the cation exchange column, after which the Y is retained as an anionic complex, sodium citrate, in the anion exchange column. The effluent milk is discarded and the Y complex on the anion exchange resin is destroyed with HCl. The Y, eluted with the acid, is precipitated as the oxalate, and the radiortrium is measured with a lowbackground beta counter. (P.C.H.)
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