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Solubility and hydrolysis of Fe(ii) under hyperalkaline conditions
Paul Quentin Fürst1, Sven Hagemann2, Neşe Çevirim-Papaioannou1
1Karlsruhe Institute of Technology, Institute for Nuclear Waste Disposal (KIT-INE) Karlsruhe Germany p.fuerst@kit.edu xavier.gaona@kit.edu.
None:
The speciation and solubility of iron under reducing, hyperalkaline conditions was investigated through undersaturation solubility experiments in combination with solid phase characterization by XRD. The solubility of a well-defined Fe(OH)2(cr) solid phase was studied at T = (25 ± 2) °C in aqueous solutions containing 0.10 to 4.20 m KOH and 1.06 to 22.73 m NaOH. Experimental data were used to derive chemical, thermodynamic and (Specific Ion Interaction Theory (SIT), Pitzer) activity models that accurately describe iron solubility under these conditions. These results support Fe(OH)3 - as the main aqueous iron(ii) species up to 1 m NaOH/KOH, while Fe(OH)4 2- dominates at higher hydroxide concentrations.
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