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Large Scale Fixed Bed Ion-Exchange System for Removing Strontium-90 from Fluid Milk. II. Compositional Studies¹

Producers Creamery Company, Springfield, Missouri

H. E. Walter

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

Jack H. Fooks

Research Branch, Division of Radiological Health, Public Health Service U. S. Department of Health, Education, and Welfare Washington, D. C.

ABSTRACT

Nine runs of 45,400 liters of milk per 8-hr day have been made, resulting in an average of 91.7% removal of environmental levels of Sr⁹⁰. No significant increase in microbial population occurred during the runs, and the keeping quality of the processed milk appeared to be satisfactory. Flavor scores averaged 37.2 after processing, a decrease of 0.6 from the untreated samples. Minor compositional changes were found in freezing point, curd tension, titratable acidity, and ash. There was an increase of 0.36% in concentration of potassium citrate, due to acidification and neutralization of the milk. The remaining components tested showed insignificant changes.

¹ A report of work done under contract with the U. S. Department of Agriculture and authorized by the Research & Marketing Act of 1946. The contract was supervised by the Eastern Utilization Research and Development Division of the Agricultural Research Service. Funds were jointly provided by Agricultural Research Service and the Division of Radiological Health of the Public Health Service, USDHEW.