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A Potentiometric, Spectrophotometric and Pitzer Ion-Interaction Study of Reaction Equilibria in the Aqueous H+-Al3+, H+-Oxalate and H+-Al3+-Oxalate Systems up to 5 mol⋅dm−3 NaCl

  • Special Issue Dedicated to Joseph Antoine Rard
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Abstract

The aqueous speciation of the mixed H+-Al3+-oxalate (L) system at equilibrium was determined by potentiometry in solutions of 0.1, 1.6 and 3.0 mol⋅dm−3 NaCl and by spectrophotometry in solutions of 5.0 mol⋅dm−3 NaCl at 298.2 K. These experiments enabled the description of the ionic strength dependence of the AlL+,AlL −2 and AlL 3−3 species and the formulation of a Pitzer ion-interaction model. The accuracy of our aqueous speciation calculations for this mixed system was also strengthened by experimental validation of previously-established models for the protonation of oxalate in the H+-L system and of the hydrolysis of Al3+ in the H+-Al3+ system. The latter system also enabled the formulation of a new Pitzer ion-interaction model for the heptavalently-charged Al13O4(OH) 7+24 Keggin ion to 3.0 mol⋅dm−3 NaCl. The proposed set of parameters can be used to predict chemical speciation in the mixed H+-Al3+-L system in aqueous solutions of NaCl up to 5.0 mol⋅dm−3 (5.6 mol⋅kg−1 NaCl) at 298.2 K.

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  1. Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA, 99352, USA

    Jean-François Boily, Odeta Qafoku & Andrew R. Felmy

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  1. Jean-François Boily
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  2. Odeta Qafoku
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Correspondence to Jean-François Boily.

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Boily, JF., Qafoku, O. & Felmy, A.R. A Potentiometric, Spectrophotometric and Pitzer Ion-Interaction Study of Reaction Equilibria in the Aqueous H+-Al3+, H+-Oxalate and H+-Al3+-Oxalate Systems up to 5 mol⋅dm−3 NaCl. J Solution Chem 36, 1727–1743 (2007). https://doi.org/10.1007/s10953-007-9203-9

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