Strontium in Milk. I. Removal by Means of Reverse-Flow Ion Exchange Columns

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Abstract
Milk from cows given single oral doses of Sr89 and Ca45 was separated into skimmilk and cream. The skimmilk was passed upward through a column containing 50 g of Dowex 50W-X12. The C form of the resin was more effective in the removal of the isotopes than the Na form. Between 70 and 80% of the Sr89 and Ca45 was removed from the 2d 100 ml passed through the column; whereas, in the 10th 100 ml, 50% of each isotope was removed. A slightly greater removal was obtained when the isotopes were put into the milk than when they were fed to the cow. Treated milk contained more C, had a lower pH, greater titratable acidity and shorter rennet coagulation time than untreated milk. Resin preference of Sr over C was shown.

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