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.
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Herrington et al. (1960) studied this question.
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