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The Rapid Determination of Minerals and Ions in Milk. II. Determination of Chloride

Nestlé Products, Research Laboratories, Vevey, Switzerland

ABSTRACT

A titrimetric and potentiometric method are presented and evaluated for the determination of chloride in milk and milk products. The titrimetric procedure involving direct titration of the chloride with mercuric nitrate in a nitric acid solution can not be applied satisfactorily to the determination of chloride in low concentrations (that is, below 4 to 10 mg. of chloride per 100 ml. of solution). However, it is applicable to determination in milk and many milk products. Precipitation of proteins with nitric acid is preferred to ashing for obtaining the solution for titration. The potentiometric method for chloride, involving the determination of the potential between a silver-silver chloride electrode and a palladium-mercury calomel reference electrode, when immersed in the test solution, is accurate and very rapid. An accuracy of +5 or +2% is obtainable, depending upon the sensitivity of the potentiometer. Care must be taken to keep the temperature of the solution constant and the silver-silver chloride has to be protected from contamination. Substances capable of dissolving the silver chloride coating, such as free amino acids, must be inactivated by the addition of copper sulfate to the sample solution.