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A Potentiometric Method for the Determination of Chloride in Milk¹

Department of Dairy Industry, Cornell University, Ithaca, New York

ABSTRACT

When chlorides in milk are titrated directly with silver, the results are too high because of interference by protein. This interference can be eliminated by titration in nitric acid solution at a pH near 2.0. A pure silver electrode can be used to detect the end point in the acid solution. This electrode may be substituted for the glass electrode of a pH meter, using a saturated calomel electrode of the asbestos fiber type as reference electrode.

If the use of nitric acid is considered undesirable, it is possible to substitute potassium aluminum sulphate for the nitric acid but much more is required. The results are almost the same as with nitric acid. If necessary, a correction should be made for chloride in the alum.

This potentiometric procedure at pH 2.0 is practically as fast as the direct chromate titration and it is believed to avoid the errors involved in other procedures which have been proposed.

¹ Early papers on argentometric methods for chloride were reviewed by George P. Sanders, The Determination of Chloride in Milk, J. Dairy Sci., 22: 841. 1939.

² Department of Dairy Science, University of Florida, Gainesville.