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Department of Dairy and Food Science, Cornell University, Ithaca, New York
ABSTRACT
The procedure commonly used to determine salt in cheese (1) is a modification of the Volhard technique, including the wet-ashing procedure of Davies (2). This procedure has many obvious disadvantages, i.e., large amounts of highly toxic fumes are produced, many operations are involved, and an excess of an expensive reagent, AgNO3, is employed. Silverman et al. (4) simplified the standard procedure by eliminating filtration through the use of nitrobenzene. A potentiometric method for the determination of NaCl in milk, published by Herrington and Kleyn (3), suggested further simplification of salt analysis for cheese.
MATERIALS AND METHODS
A Beckman pH meter, model H2, was used as the potentiometer and a silver electrode was prepared as described by Herrington and Kleyn (3). The reference electrode was a Beekman saturated calomel electrode. Preliminary experiments showed that a sharper change in potential is obtained at the end point at approximately pH 2.0, a fact also observed for milk by Herrington and Kleyn (3).
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