The solubility of colloidal ferric hydroxide and its relevance to iron concentrations in river water

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Scientific paper

Concentrations of dissolved iron in equilibrium with colloidal ferric hydroxide were experimentally determined by dialysis followed by atomic absorption spectroscopy. The results were compared to values obtained from the literature. The referenced values were determined by electrochemical methods under a wide variety of experimental conditions which necessitated corrections for the presence of ferric complexes and for variations in ionic strengths. The combined set of historical and present data was consistent with the mass action equation, Fe 3+ 2.35 OH - = 10 -31.7 , where i , is the activity of species i . The equation is proposed to represent the solubility of aqueous ferric hydroxide colloids. Published data from rivers, corrected for incomplete separation of colloidal from dissolved iron and, dialyzed samples of Delaware River water with pH values adjusted to range between 5 and 8 were fit to the solubility equation. Both sources of evidence demonstrated concentrations of dissolved iron to be near saturation with colloidal ferric hydroxide.

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