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G. Atun, N. Bodur, N. Ayyildiz, N. Ayar, B. Bilgin

Kinetics of isotopic exchange between calcium molybdate and molybdate ions in aqueous solution

Keywords: Isotope exchange, Calcium molybdate, Paterson’s equation, Nernst-Plank equation, Exchange kinetics

The heterogeneous isotopic anion exchange kinetics and equilibria between calcium molybdate and sodium molybdate solutions have been studied by using ⁹⁹Mo as tracer in batch experiments. The values of exchange ratio lower than unity suggest that rate-limiting step is particle diffusion process and the effect of re-crystallization can be neglected. The self-diffusion coefficients calculated using both Paterson´s and Nernst–Plank approximations are increased by the temperature. The observed values for isotope exchange characteristics such as exchange fractions, exchanging amounts and fractional attainment of equilibrium are consistent with those of their calculated values. Activation energy and thermodynamic parameters calculated based on transition state theory indicate the existence of both energy and entropy barrier in the system.

Radiochimica Acta, Oldenbourg Wissenschaftsverlag

Print ISSN: 0033-8230
Volume: 95, 03/2007
Pages: 177 - 182

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