A POTENTIOMETRIC STUDY OF EU3+ COMPLEXATION WITH ACETATE LIGAND FROM 25 TO 170°C AT P SAT
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dc.contributor.author | Zotov A.V. | |
dc.contributor.author | Tagirov B.R. | |
dc.contributor.author | Diakonov I.I. | |
dc.contributor.author | Ragnarsdottir K.V. | |
dc.date.accessioned | 2021-09-23T04:09:47Z | |
dc.date.available | 2021-09-23T04:09:47Z | |
dc.date.issued | 2002 | |
dc.identifier | https://elibrary.ru/item.asp?id=13413627 | |
dc.identifier.citation | Geochimica et Cosmochimica Acta, 2002, 66, 20, 3599-3613 | |
dc.identifier.issn | 0016-7037 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/30519 | |
dc.description.abstract | Thermodynamic properties for europium acetate (EuCH3COO2+ and Eu(CH3COO)2+) complexes were studied by potentiometry at temperatures from 25 to 170°C at the saturation pressure of water. The thermodynamic association constants (K1 and K2) for the reaction Eu3+ + n Acite− = EuAcn3−n. were determined by two different experimental approaches at 25 to 75°C and 75 to 170°C. Logarithms of measured association constants increase with increasing temperature, showing that Eu-Ac complexing increases as temperature rises. Log K1 for EuCH3COO2+ increases from 2.91 at 25°C to 4.25 at 170°C, whereas log K2 for Eu(CH3COO)2+ increases from 4.83 at 25°C to 7.39 at 170°C. Species distribution calculated in this study using the experimentally determined association constants suggests that in acetate-bearing solutions (≥0.05 m) Eu-acetate complexes dominate over the free ion above pH of 4 to temperatures of at least 200°C. At equal total acetate and carbonate concentrations and at 25°C, the relative stability of carbonate and acetate complexes is close. However, as the temperature rises the relative stability of carbonate versus acetate complexes is model dependent. | |
dc.title | A POTENTIOMETRIC STUDY OF EU3+ COMPLEXATION WITH ACETATE LIGAND FROM 25 TO 170°C AT P SAT | |
dc.type | Статья |
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