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Astatine Standard Redox Potentials and Speciation in Acidic Medium

Abstract : A combined experimental and theoretical approach is used to define astatine (At) speciation in acidic aqueous solution and answer the two main questions raised from literature data: does At(0) exist in aqueous solution and what is the chemical form of At(III), if it exists. The experimental approach considers that a given species is characterized by its distribution coefficient (D) experimentally determined in a biphasic system. The change in speciation arising from a change in experimental conditions is observed by a change in D value. The theoretical approach involves quasi-relativistic quantum chemistry calculations. The results show that At at the oxidation state 0 cannot exist in aqueous solution. The three oxidation states present in the range of water stability are At(-I), At(I) and At(III) and exist as At-, At+ and AtO+, respectively, in the 1 to 2 pH range. The standard redox potentials of the At+/At- and AtO+/At+ couples have been determined, the respective values being 0.36 ± 0.01 and 0.74 ± 0.01 V vs. NHE.
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Submitted on : Wednesday, January 27, 2010 - 10:25:46 AM
Last modification on : Wednesday, April 27, 2022 - 4:34:56 AM
Long-term archiving on: : Friday, June 18, 2010 - 1:29:33 AM


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Julie Champion, C. Alliot, E. Renault, M. Mokili, M. Chérel, et al.. Astatine Standard Redox Potentials and Speciation in Acidic Medium. Journal of Physical Chemistry A, 2010, 114, pp.576-582. ⟨10.1021/jp9077008⟩. ⟨in2p3-00450771⟩



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