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Removal of Radionuclides from Milk

Milk and Food Researeh, Robert A. Taft Sanitary Engineering Center, U. S. Department of Health, Education, and Welfare, Public Health Service, Cincinnati, Ohio

ABSTRACT

Removal of iodine¹³¹ (I¹³¹) and restoration of anionic composition during neutralization of milk acidified and treated with cationic resin in the Ca:Mg:K:Na cycle employed for the removal of cationic radionuclides from milk was investigated. Milk labeled with I¹³¹ in vitro was acidified to pH 5.35 with citric acid and then restored to pH 6.8 by the batch process with the addition of 1.0 to 1.2 g Dowex 1-X8 (Cl^-:OH^-) resin per 100 ml of milk at 45-sec intervals. The resin in the chloride cycle, conditioned with NaOH and HCl to eliminate free amines, was previously equilibrated with 1.5 N NaOH by the column batch technique so as to yield a Cr^-:OH^- ratio of 0.850:0.150.

Analysis of treated milk indicated that approximately 96.5 ± 1.2% of I¹³¹ and 85.2 ± 5.6% of excess of citric acid were removed, and that the neutralization process increased the chloride content by 7.0 ± 1.0% and decreased inorganic phosphate content by 35.3 ± 2.2%. Approximately 12–14 g of resin were required to neutralize 100 ml of milk. The removal of I¹³¹ was greatly influenced by the (OH^-) in the resin phase and by the rate and extent of neutralization. The totals of anionic components of treated and untreated milks were comparable, which is an improvement over the previously described methods of neutralization.