Hydrogen isotope fractionation of water molecules in crystalline hydrates of divalent transition metal dichloride, hydration complex and water vapor system.

Abstract

The hydrogen isotopic (D/H) fractionation factors between the crystal water of crystalline hydrates and the saturated aqueous solutions of divalent transition metal (cobalt, nickel and copper) dichloride and between the aqueous solutions and their vapor were experimentally determined under equilibrium condition. The crystal water of these crystalline hydrates exhibits larger depletion of deuterium than the saturated aqueous solutions. And the water vapor equilibrated with these aqueous solutions exhibits larger enrichment of deuterium than the water vapor equilibarated with pure water. These facts indicate that the hydration complex is depleted in deuterium.