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Correlation and Relative Precision of Two Methods of Measuring the Chloride Content of Milk¹

Department of Dairy Science, University of Florida, Gainesville

ABSTRACT

New tests have been developed recently for estimating the chloride content of milk (1, 4). For many years modifications of Mohr's direct titration method, in which chloride is titrated with a standardized solution of silver nitrate in the presence of potassium chromate indicator, have been in general use in this country (2). These methods have yielded values which were artificially high primarily because of interference by casein. The new potentiometric methods were developed to eliminate this source of error. The objectives of this investigation were (a) to compare the precision of a commonly used modified direct titration method (3) with the precision of one of the new potentiometric methods (1), and (b) to compare the results obtained by one of these methods with those of the other.

In comparing the precision of the two methods, composite (A.M. and P.M.) milk samples were collected at random from individual cows in the Florida Agricultural Experiment Station herd.

¹ Florida Agricultural Experiment Station Journal Series, No. 1088.