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Pilot Plant Fixed-Bed Ion-Exchange Resin System for Removing Iodine-131 and Radiostrontium from Milk¹

Dairy Products Laboratory, Eastern Utilization Research and Development Division, USDA, Washington, D. C.

ABSTRACT

Fixed-bed pilot plant ion-exchange columns were arranged for removing both iodine-131 and radiostrontium from milk by passing the milk first through an anion resin column to remove iodine-131, then acidifying to pH 5.3 and passing it through the cation column. This system was tested for removal of the radionuclides, and for the effect on flavor and composition of whole milk.

More than 93% of iodine-131 was removed by this system from milk in vivo labeled with the isotope, and 90% of environmental levels of strontium-90 removed. Although the resin-treated milks were rated slightly lower than control samples by a trained panel, they were considered acceptable and satisfactory as beverage milk. Composition analysis showed that some of the milk fat was adsorbed by the anion resin near the end of an 8-hr run; loss of solids-not-fat was much less.

¹ A joint research project supported by ARS, AEC, and PHS.