Abstract
A low-molecular-weight dialysis membrane was used to exclude colloidal ferric oxyhydroxide solids with molecular weights of > 6000–8000 daltons from a portion of an anaerobic ferric/ferrous chloride solution. Redox potential measurements taken in the presence and absence of colloidal ferric solids agree within ± 7 mV, indicating that ferric colloids of this size are redox inactive. Experiments conducted under varying solid.aqueous ferric ratios also indicate that ferric solids do not contribute exchange current density and are therefore inactive. In spite of tabulated exchange currents which indicate stable potentials require ⩾ 10 −5 M Fe 3+, stable electrode response was seen in solutions as dilute as 10 −6 M Fe 3+. Differences in experimental conditions may cause this difference in observed results.
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