Uranyl complexation with acetate studied by means of affinity capillary electrophoresis
2013
Sladkov, Vladimir
The interaction of uranyl with acetate is studied by affinity capillary electrophoresis in aqueous acid solutions at the pH values 2.0 and 2.5. The use of data on metal ion mobilities at different pHs allows to establish the ligand species interacting with metal ion and complex species formed. The formation of two complex species UO₂CH₃COO⁺ and UO₂(CH₃COO)₂ is observed (acetic acid concentration is up to 0.8M). In the case of uranyl-acetic acid system, the viscosity of solution is significantly changed with an increase of acid concentration. For calculation of ion mobilities the viscosity changes are taken into account. The stability constants are calculated at the ionic strengths 0.02 and 0.05molL⁻¹. The logarithms of the thermodynamic stability constants (β°) calculated with Davies equation for the activity coefficients of the ions are logβ₁ °=2.94±0.08 and logβ₂ °=5.50±0.15 at 25°C. Obtained values are compared with literature data.
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