We have assessed the accuracy and precision of our flowing afterglow mass spectrometric method (FA-MS) for absolute measurements of deuterium abundance in water using standardised tap water/D(2)O mixtures within the D/H range from 155 ppm (local tap water) to 1104 ppm, prepared by the gravimetric method. The results of this study show that a precision and accuracy of 1% can be achieved for the deuterium abundance in water samples. This is quite adequate for the main application, which is the rapid, non-invasive measurement of total body water by deuterium analysis of breath water vapour using the D(2)O dilution method.

5 Cermák Laboratory J Heyrovský Institute of Physical Chemistry Academy of Sciences of the Czech Republic Dolejskova 3 182 23 Prague 8 Czech Republic

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Determination of the deuterium abundances in water from 156 to 10,000 ppm by SIFT-MS

Longitudinal measurements of total body water and body composition in healthy volunteers by online breath deuterium measurement and other near-subject methods