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The Determination of Moisture in Powdered Milk by the Toluol Distillation Method

The Borden Company, New York and Syracuse, N. Y.

ABSTRACT

Ever since Bidwell and Sterling (17) developed the toluol distillation method for the determination of moisture in organic materials, and applied it to a limited extent to powdered milk, there has been an interest in its application to the routine determination of moisture in powdered milk. The ease of operation, direct reading and rapidity of obtaining results appealed to the control operator. Wright (2) pointed out that there was some danger of obtaining results that were too high, if the heating was unduly prolonged. Thompson, Slemmons and Fleming (3) and Thompson, Johnson and Kloser (4) recommended this method for control work and gave the details of procedure. The American Dry Milk Institute (5) gives this as the method they prefer for dry skim milk powder.

In view of the increasing interest in the use of this method, it seemed wise to again consider its accuracy. A series of samples of spray process, vacuum roller and atmospheric roller milk powders, both skim and whole, was obtained and these were carefully tested for moisture both by the toluol distillation method and the vacuum oven method.