Reports

Deuterium: Natural Variations Used as a Biological Tracer

Science  11 Sep 1970:
Vol. 169, Issue 3950, pp. 1085-1086
DOI: 10.1126/science.169.3950.1085

Abstract

The suggestion is made that isotope tracing be carried out by monitoring the natural variations in deuterium concentrations. As an example, the natural variations in deuterium concentrations between food and water collected in Illinois and food and water collected in Colorado were used to determine the residence time of water in the blood and urine of rats. We observed not only a 5½-day turnover time of water in the blood and urine, but also evidence for the influx of water vapor from the atmosphere through the lungs into the blood.

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