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Abstract
The D/H fractionation factors (..cap alpha..) of some of the sulfate hydrate-water systems were measured. A dependence of ..cap alpha.. on cationic parameters and M-H/sub 2/O distance was found. The D/H fractionation factors of various hydrate-water systems were divided into two groups with respect to their ..cap alpha.. values: one having ..cap alpha.. 1. There is almost no change in ..cap alpha.. for crystal-water systems having SO/sub 4//sup 2 -/ as the anion of the first transition metallic ion series from Fe/sup 2 +/ to Zn/sup 2 +/ except for Cu/sup 2 +/. The result is related to the common structure of the hydration sphere of cations and the common distance of M-H/sub 2/O. The exceptional case for Cu/sup 2 +/ is attributed to the distorted structure of octahedra surrounding Cu/sup 2 +/. A similar type of behavior of protons leading to the residual entropy has been found in some of the crystal-water systems having ..cap alpha.. > 1. 45 references, 3 figures, 3 tables.
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