|Author||Geletseany, I. ♦ Palitskii, A. V.|
|Source||United States Department of Energy Office of Scientific and Technical Information|
|Subject Keyword||CHEMISTRY ♦ ACIDITY ♦ CITRIC ACID ♦ DISTRIBUTION ♦ DOWEX ♦ EDTA ♦ HYDROLYSIS ♦ ION EXCHANGE ♦ ION EXCHANGE MATERIALS ♦ ORGANIC ACIDS ♦ OXALIC ACID ♦ POLYMERIZATION ♦ PROTACTINIUM 233 ♦ PROTACTINIUM COMPLEXES ♦ QUANTITATIVE ANALYSIS ♦ STABILITY ♦ THORIUM NITRATES ♦ TRACER TECHNIQUES|
|Abstract||Tracer Pa/sup 233/, isolated from irradiated thorium nitrate by ion exchange, was used to follow complexing of protactinium by lactic acid, alpha - hydroxy-isobutyric acid, mandelic acid, malic acid, tartaric acid, trihydroxy glutaric acid, oxalic acid, citric acid, aconitic acid, and ethylenediaminetetraacetic acid. The distribution coefficients were determined for the cation exchanger Dowex 50 and the anion exchanger Dowex 1 at a constant ionic strength of mu = 0.25. The pH was held constant at approximates 1.0, and the concentration of complexing agent was varied. Instability constants were calculated by the methods of Paramonova and of Froneus. On increasing the concentration of the complexing agent or the pH of the medium, the distribution coefficient dropped off due to the formation of large polynuclear complexes, and to an increase in hydrolysis. In strong acid solutions, polymerization of Pa takes place by the formation of Pa-O-Pa oxygen bridges. In weakly acid solutions, polymerization of Pa takes place by intramolecular hydrogen bonding between hydroxy groups. Mandelic acid did not form polymers with Pa. The stability of the protactinium complexes with the various complexing agents decreases in the following order: EDTA > citric > oxalic > trihydroxyglutaric > alpha -hydroxy(TTT)|
|Learning Resource Type||Article|
|Journal||Doklady Akad. Nauk SSSR|
|Organization||Moscow State Univ.|
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