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The development of an accurate aqueous thermodynamic model is described for oxalate species in the Na—Ba—Ca—Mn—Sr—Cl—NO3—PO4—SO4—H2O system at 25 °C. The model is valid to high ionic strength (as high as 10 mol·kg−1) and from very acid (10 mol·kg−1 H2SO4) to neutral and basic conditions. The model is based upon the equations of Pitzer and co-workers. The necessary ion-interaction parameters are determined...
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