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The Mineral Exchanges of Man

I. Organization of Metabolism Ward and Analytical Methods

Samuel H. Bassett, C. A. Elden and W. S. McCann

(From the Department of Medicine of the School of Medicine and Dentistry, University of Rochester, and the Medical Clinic of the Strong Memorial Hospital, Rochester, N. Y.)

This paper gives in detail the technique for a comprehensive study of the simultaneous exchanges of sodium, potassium, calcium, magnesium, iron, nitrogen, and phosphorus.

1. The organization and methods of a special metabolism ward are described.

2. A comparison is made of the results of analyzing an entire diet for a day and of calculating the total mineral intake from tables. The values found for calcium were consistently lower than the calculated, and for sodium consistently higher. The discrepancies in the case of nitrogen, phosphorus, potassium, magnesium, and iron were of smaller magnitude, within the limits of accuracy of the procedure as a whole.

3. The same diet menus, weighed out and analyzed in different years, showed surprisingly close agreement on analysis.

4. The methods of preparation of foods and excreta for sampling, ashing, and analysis are given in detail.

The analytical methods used were selected after many trials as those giving the best results with the materials of both foods and excreta.

Manuscript received 26 September 1930.

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