Direct measurements of D/H and ¹⁸O/¹⁶O fractionation factors between vapor and liquid water in the temperature range from 10 to 40°C

Abstract

Vapor phase was separately collected without liquid condensate by raising the temperature of the container of vapor phase by 7°C higher than that of the interface of vapor-liquid equilibrium. D/H and ¹⁸O/¹⁶O measurements were done for the identical aliquot of vapor samples in equilibrium with the liquid water in the temperature range from 10 to 40°C. The empirical relationships between α_D, α^18O and the temperature of equilibration were obtained to be, 10³lnα_D = 2.408 × 10⁶T^-2 + 6.455 × 10⁴T^-1 - 168.7, 10³lnα_18O = 5.9702 × 10⁶T^-2 - 3.2801 × 10⁴T^-1 + 52.227.