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A potentiometric study of the stability of aqueous yttrium-acetate complexes from 25 to 175 °C and 1-1000 bar |
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| Authors: | Boris Tagirov Alexander Zotov Oleg Suleimenov |
| Affiliation: | a LMTG (Géochimie et Biogéochimie Expérimentale), CNRS-OMP-Université Paul-Sabatier, 14 Avenue Edouard Belin, 31400 Toulouse, France b Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry RAS, 35 Staromonetnyi per., Moscow 119017, Russia c Institute for Mineralogy and Petrography, ETH Zurich, Universitaetstrasse 16, CH 8092 Zurich, Switzerland |
| Abstract: | The stability of yttrium-acetate (Y-Ac) complexes in aqueous solution was determined potentiometrically at temperatures 25-175 °C (at Ps) and pressures 1-1000 bar (at 25 and 75 °C). Measurements were performed using glass H+-selective electrodes in potentiometric cells with a liquid junction. The species YAc2+ and  were found to dominate yttrium aqueous speciation in experimental solutions at 25-100 °C (log [Ac−] < −1.5, pH < 5.2), whereas at 125, 150 and 175 °C introduction of  into the Y-Ac speciation model was necessary. The overall stability constants βn were determined for the reaction |
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