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Journal of Dairy Science Vol. 51 No. 9 1373-1376
© 1968 by American Dairy Science Association ®
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New Method for Stripping Iodine-131 from the Anion Exchange Resin Used to Remove Radionuclides from Milk

J. P. Walker1, B. F. Rehnberg and I. B. Brooks

Southeastern Radiological Health Laboratory, Montgomery, Alabama

ABSTRACT

This investigation was made to find an alternate stripping agent for the removal of 131I from Dowex 2 X-8 20–50 mesh resin used to remove this nuclide from fluid milk. The agent currently utilized is 2 N HCl, which has the disadvantages of causing extreme corrosion to the stainless steel equipment used in modern dairies and of being expensive.

The chloride : citrate : phosphate charged resin was equilibrated over-night with Na 131I and 80-ml portions were placed in 25-mm diameter, jacketed columns. The resin beds were rinsed with six bed volumes of deionized water, 0.25 bed volumes per minute, at 25 C and stripping solutions were passed through. The stripping solutions were NaCl and a mixed salt containing sodium chloride, sodium citrate and monobasic sodium phosphate. The parameters controlled in this investigation included concentration, temperature, flow rate and total volume.

The optimum stripping technique was 30 bv of 1 N NaCl solution at a flow rate of 0.5 bv/min at 71 C. The stripping efficiency was approximately 96%. This technique was calculated to save approximately $1,380.00 in raw materials and operating costs per 45,500 liters of milk processed during each total capacity run at the commercial scale project when compared with the 2 N HCl stripping method.

FOOTNOTES

1 Present address: Chief Pharmacist, Madison Hospital, Madison, Tennessee.






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Copyright © 1968 by the American Dairy Science Association ®.