Year: 2026
Type: article
Abstract: 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.
Language: English
Subfield: Filtration and Separation
Field: Chemical Engineering
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7170040420
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