Potentiometric Study of Aluminium-Fluoride Complexation Equilibria and Definition of the Thermodynamic Model |
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Authors: | M S Corbillon M A Olazabal J M Madariaga |
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Institution: | (1) Department of Analytical Chemistry, University of the Basque Country, P.O. Box 644 PK, 48080 Bilbao, Spain |
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Abstract: | Complexation constants of the Al3+/F− system were determined at different ionic strengths in a NaClO4 (1.0, 2.0 and 3.0 mol⋅dm−3) ionic medium by means of a potentiometry using two electrode systems: an ion fluoride selective electrode as well as a glass
electrode. All the experimentation was performed at 25 °C. The main species in the complexation equilibria were determined
as AlF2+, AlF2+, AlF30, AlF4−, AlF52− and AlF63−. The differences found in the complexation constants for the ionic strength considered were explained by the different behavior
of the interaction parameters for the AlF
n
3−n
species. These parameters were calculated using the Modified Bromley’s Methodology (MBM). The corresponding thermodynamic
quantities were also determined. From all the results obtained, it can be concluded that pH, fluoride concentration and ionic
strength influenced the distribution of the fluoride-aluminium complexes. |
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Keywords: | Aluminium fluoride complexation Thermodynamic model Interaction parameters |
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