The deuterium isotope separation factor between hydrogen and liquid water

Abstract

Publication costs assisted by Atomic Energy of Canada LimitedThe overall deuterium isotope separation factor between hydrogen and liquid water, a, has been measured directly for the first time between 280 and 370 K. The data are in good agreement with values of a calculated from literature data on the equilibrium constant for isotopic exchange between hydrogen and water vapor, Ki, and the liquid-vapor separation factor, • The temperature dependence of a over the range 273-473 K based upon these new experimental results and existing literature data is given by the equation In a = -0.2143 + (368.9/T) + (27 870/T2). Measurements on ay given in the literature have been surveyed and the results are summarized over the same temperature range by the equation In ay = 0.0592 -(80.3/T) + (25 490/T2).

Kinetics and reactive stripping modelling of hydrogen isotopic exchange of deuterated waters

“…The values of separation factor at atmospheric pressure is within a reasonable agreement (i.e. deviation of 1.2 %) with the model proposed by Rolston et al [40]. The effect of total pressure was investigated by the CEPE model while a negligible deactivation by pore condensation of water was assumed.…”

Nonequilibrium clumped isotope signals in microbial methane

“…We compiled previously-published equilibrium hydrogen-isotopic fractionation factors calibrated at various temperatures, either experimentally or theoretically, for the system CH 4 (g)- (36,56,57). The uncertainty in calibration, as well as salt and pressure effects (58), could explain small apparent offsets from the equilibrium line (Fig.…”

On the reproducibility and repeatability of laser absorption spectroscopy measurements for δ<sup>2</sup>H and δ<sup>18</sup>O isotopic analysis

“…The precision of δ 18 O and δ 2 H measurements, achieved with the IRMS technique was ±0.05‰ and ±0.7‰, respectively. Further information regarding the IRMS theory of operation and method is available in Roether (1970); Rolston et al (1976);Hut (1987), and Horita and Kendall (2004).…”