Isotope effects in dissociation

In the last few years isotope separation in aqueous solutions by counter-current electromigration has found renewed interest. The reason for this renaissance is the hope that isotope effects in dissociation equilibria might substantially increase the effective relative difference in mobilities and make aqueous solutions a medium for a successful separation of isotopes. In this review we have summarized the available relevant data. 

In Figures 2, 3, and 4, the results of the various measurements of the relative difference in mobilities of isotopes in aqueous solutions have been summarized. Mi/u always means the effective relative difference in mobilities with respect to water. It includes possible contributions of isotope effects in dissociation equilibria. In judging the results it has to be kept in mind that the errors in Aw/iz are at least of the order of 0.001. 

The oxygen-18 isotope effect in dissociative chemisorption of O2 on the Ag(lll) surface has been observed ", when the Ag(lll) crystal heated to 450 K was exposed to a 50% 02-50% 02 mixture at a total pressure of 0.05 mbar for 15 s in a high pressure cell and then heated to 860 K in a linear fashion at simultaneous monitoring of desorbing 02, and 2 molecules, formed by recombination of atomic oxygen on... 

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