Kinetics of isotopic exchange between calcium molybdate and molybdate ions in aqueous solution
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G. Atun
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.
© Oldenbourg Wissenschaftsverlag
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Artikel in diesem Heft
- Yield and excitation function measurements of some nuclear reactions on natural thallium induced by protons leading to the production of medical radioisotopes 201Tl and 203Pb
- Production of no-carrier-added 123I via heavy-ion activation of natural antimony oxide
- Sorption behavior of curium(III) on hydrous silica: a kinetic and thermodynamic study
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- Comparative study on ion-isotopic exchange reaction kinetics by application of tracer technique
- Kinetics of isotopic exchange between calcium molybdate and molybdate ions in aqueous solution
- Separation of 137mBa from its parent 137Cs from an equilibrium mixture using amide incorporated Amberlite IRC-50
