The behaviour of aqueous spinel-like iron oxide colloids in the presence of metal ions, and especially Fe2+, has been studied protometrically and structurally. Fe2+ adsorption is shown to proceed reversibly with the release of two protons per adsorbed ion; subsequent implication of an Fe3O4 outer shell is demonstrated. All the experimental features support electron transfer involving an octahedral site sub-lattice of the whole colloid.
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Tronc et al. (1984) studied this question.