Abstract Data from published oxygen isotope exchange experiments involving H 2 O and CO 2 have been used to determine the reduced partition function ratios of liquid and supercritical fluid H 2 O and CO 2 . These data are compared with a recalculation of the reduced partition function ratios for the vapor phase of each species.
T is in Kelvin.
Supercritical fluid carbon dioxide behaves similarly to CO 2 vapor, but there is a measurable difference between the partitioning behavior of supercritical fluid, liquid, and gaseous H 2 O which must be considered when dealing with geological fluids.