Abstract
Abstract Laboratories using forced air atmospheric ovens at 100°C to determine total solids in milk are interested in using the same equipment to measure total solids in nonfat dry milk powder (NFDM). Results of several studies previously were presented to the Association. Another collaborative study involving 5 laboratories was done this year. The results of the new study confirm the previous work; the forced air method gives results not significantly different from the official vacuum oven procedure. Throughout these studies, it was noted that strong thermal gradients in some vacuum ovens made it difficult to uniformly subject each sample to the specified amount of heat. It was also found that fresh whole milk and reconstituted NFDM can be tested successfully when the steam bath step is omitted from the official method for milk by increasing the drying time to 4½ hr.
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