Abstract
The isotope effect manifested in phase transitions in deuterium-substituted aqueous solutions of sulfuric acid was found. The phase transitions occurring with variation of temperature of 0.5 M H2SO4 solution in H2O, 0.5 M D2SO4 solution in D2O, and their mixtures were studied by differential thermal analysis. Additional data on the phase transitions in these samples were obtained using chemiluminescence [low-temperature reaction of U(IV) with XeF2] and τ-metry (measurement of the lifetime τ of uranyl ion UO22+ in the electronically excited state). The uranyl ion was used as a luminescence probe. The whole set of data obtained can be interpreted on the basis of the concept that a mixture of 0.5 M H2SO4 and 0.5 M D2SO4 solutions (H/D = 1), subjected to fast (10–15 K s−1) cooling to 77 K followed by warming, contains a liquid phase in which the deuterium content in the temperature range 202–210 K is higher than that in the initial solution.
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