Abstract
The distribution of pertechnetic, permanganic, chromic, oxalic, acetic, formic, hydrazoic, nitrous, hydrofluoric, and hydrochloric acids and of hydrogen peroxide is considered within the framework of a new approach to modeling of extraction equilibria involving tributyl phosphate (TBP) in diluent. The approach is similar to that used for describing the extraction of nitric acid. Namely, the formation of solvates with TBP and the dissolution of the acids in water present in the organic phase are considered. Possible dissociation and dimerization of acids in both phases and association with the nitric acid-TBP monosolvate are taken into account. The coextraction of acid anions with uranyl is described taking into account the anion exchange and complexation with acid anions in the organic phase, with such complexation also occurring in the aqueous phase. A system of 16 equations with concentration constants or experimental equilibrium parameters is suggested for describing the extraction of impurity acids and coextraction of their anions.
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