HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Easterly, D. G. Articles by Cragle, R. G. Search for Related Content PubMed Articles by Easterly, D. G. Articles by Cragle, R. G.

Strontium in Milk. I. Removal by Means of Reverse-Flow Ion Exchange Columns¹

Dairy Department, University of Tennessee, Knoxville, and UT-AEC Agricultural Research Laboratory, Oak Ridge, Tennessee

ABSTRACT

Milk from two Jersey cows dosed orally with strontium⁸⁹ and calcium⁴⁵ was mechanically separated into skimmilk and cream. These radioactive isotopes were removed from the skimmilk by use of an upward-flow ion exchange resin column. Dowex 50W-X12, Dowex 50W-X4, and Duolite C-20 were used. The calcium form of ecah resin was more effective in removal of the isotopes than was the sodium form. Between 70 and 80% of the Sr⁸⁹ and Ca⁴⁵ in the skimmilk was removed from the second 100 ml. passed through the column; whereas, in the tenth 100 ml., 50% of each isotope was removed, using either of the Dowex resins. The Duolite resin was not as effective when used under these conditions.

An experiment in which Sr⁸⁹ and Ca⁴⁵ were put directly into skimmilk and allowed to stand for 16 hr. resulted in removals which followed very closely those of the experiment with skimmilk from dosed cows. However, a higher percentage of Sr⁸⁹ was removed than from the skimmilk of dosed cows.

Treated milk contained more calcium, had a lower pH, greater titratable acidity, and shorter rennet coagulation time than untreated milk. Resin preference of strontium over calcium was shown.

¹ This manuscript is published with the permission of the director of the University of Tennessee Agricultural Experiment Station, Knoxville, Tennessee. The radioactive materials used in this work were obtained from the Oak Ridge National Laboratory on allocation from the United States Atomic Energy Commission. The work was completed under Contract No. AT-40-1-GEN-242 between the University of Tennessee College of Agriculture and the Atomic Energy Commission.