J. Anim Sci.
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J. Anim Sci. 1953. 12:628-634.
© 1953 American Society of Animal Science
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A Chromatographic Method for the Determination of Cobalt in Feeds1

R. P. King2, D. W. Bolin, W. E. Dinusson and M. L. Buchanan

North Dakota Agricultural College3

Abstract

A chromatographic method for the determination of cobalt in feeds is described. The ashed sample is dissolved with HCl, filtered, and the filtrate evaporated to dryness. Perchloric acid is added and the contents evaporated to white fumes. With the addition of distilled water and nitroso R salt, the cobalt complex color is developed in the usual manner. The entire solution is passed through a perchloric acid-washed alumina column. The cobalt complex is adsorbed on the column. The excess reagent is eluted from the column with dilute HNO3. The cobalt complex is then eluted with dilute H2SO4, and determined colorimetrically.

Advantages over previous methods are that copper and iron do not interfere with the cobalt determination, and larger initial samples may be ashed to give a greater concentration of cobalt in the final solution for a colorimetric determination.

As determined by this method, the cobalt content of hays range from 0.047 to 0.468 p.p.m., cereal grains from 0.014 to 0.091 p.p.m., and plant protein concentrates (sunflower, cottonseed, and linseed meal) from 0.190 to 0.500 p.p.m.

Footnotes

1 Published with permission of the Director of the North Dakota Agricultural Experiment Station.

2 This paper is part of a thesis to be submitted to the Graduate Council of the North Dakota Agricultural College in partial fulfillment of the requirements for the degree of Master of Science.

3 Department of Animal Husbandry.






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Copyright © 1953 by the American Society of Animal Science.