URANYL ACETATE SPECIATION IN AQUEOUS SOLUTIONS-AN XAS STUDY BETWEEN 25°C AND 250°C
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dc.contributor.author | Bailey E.H. | |
dc.contributor.author | Mosselmans J.F.W. | |
dc.contributor.author | Schofield P.F. | |
dc.date.accessioned | 2022-03-21T07:44:20Z | |
dc.date.available | 2022-03-21T07:44:20Z | |
dc.date.issued | 2004 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=12090601 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 2004, 68, 8, 1711-1722 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/36540 | |
dc.description.abstract | Speciation of uranium (VI) in acetate solutions between 25 and 250°C, at pH values between 1.8 and 3.8 and acetate/uranium (Ac/U) ratios of 0.5 to 100 has been investigated using uranium LIII-edge X-ray absorption spectroscopy. With increasing pH the UO2(Ac)20 species becomes more important than UO2(Ac)+ species, which is predominant below pH 2. It remains the dominant species as pH is further increased to 3.8 at an Ac/U ratio of 20. Decrease in U-Oeq bond distance and coordination number with increasing solution age indicates that steric/kinetic factors are important and that equilibrium is attained slowly in this system with initial acetate coordination to the uranyl ion being monodentate or pseudo-bridging before slow conversion to bidentate chelation. Acetate coordination to the uranyl ion appears to decrease as temperature is increased from room temperature to ∼100°C before increasing in solutions of Ac/U > 2. For solutions where Ac/U ≤ 2 at pH 2.1, there is no evidence for uranyl acetate speciation at low temperatures, but at elevated temperature bidentate uranyl-acetate ion-pairing is evident. The existence of the uranyl acetate species in the temperature range 200 to 240°C demonstrates the importance of including acetate and other organic ligands in models of uranium transport at elevated temperatures. | |
dc.title | URANYL ACETATE SPECIATION IN AQUEOUS SOLUTIONS-AN XAS STUDY BETWEEN 25°C AND 250°C | |
dc.type | Статья |
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