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Journal of Dairy Science Vol. 29 No. 10 645-649
© 1946 by American Dairy Science Association ®
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Colorimetric Determination of Ammonia in Milk and Dry Products of Milk

R. P. Choi, C. M. O'Malley and B. W. Fairbanks

American Dry Milk Institute, Inc., Chicago, Illinois

ABSTRACT

A colorimetric method is described for the determination of ammonia in fluid milk and in dry products of milk based upon the reaction of ammonia with alkaline phenol and sodium hypochlorite. A statistical analysis of data for one sample of fluid milk shows an average deviation from the mean of 0.016 mg./l00 ml. and a standard deviation of 0.026 mg./l00 ml., indicating satisfactory reproducibility.

The ammonia content of some dry milk products and fluid milk varies considerably with dry whey solids having the highest ammonia content.






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Copyright © 1946 by the American Dairy Science Association ®.