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The Spectrographic Analysis of Milk Ashes

(From the Biochemical Laboratory, School of Hygiene and Public Health, The Johns Hopkins University, Baltimore)

1. The following elements were found in large quantities in all milk samples: calcium, magnesium, phosphorus, potassium, and sodium.

2. The following elements were found in smaller quantities (traces) in all milk samples: barium, boron, copper, iron, lithium, rubidium, strontium, titanium, and zinc. Of these barium is the only one which has not been reported previously.

3. The presence of aluminum and manganese was not definitely demonstrated, although these elements were present in the feed mixture.

4. The presence or absence of silicon and vanadium could not be established definitely owing to the presence of these elements in the graphite electrodes used.

5. The presence of antimony, arsenic, bismuth, caesium, cobalt, cadmium, fluorine (as the CaF₂ band), germanium, gold, indium, lanthanum, mercury, molybdenum, nickel, osmium, palladium, silver, zirconium, chromium, lead, and tin could not be detected, although Zbinden concludes that the last three of these elements, viz., chromium, lead, and tin, are present in European milks.

The following table shows how these results compare with those of Wright and Papish and those of Zbinden, omitting calcium, magnesium, phosphorus, potassium, and sodium, concerning whose presence in milk there is no question.