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• W2000701135 abstract "The dissolution of magnetite particles in solutions containing EDTA and FeII was studied as a function of the total concentration of EDTA and FeII; the influence of pH was also studied. The rate shows a Langmuir-type dependence on [FeY2−] when [EDTA]0 ⩽ [FeII]0. At constant [EDTA]0, in the range where EDTA is in excess over FeII, the kinetic order on FeII is one; FeII in large excess has no influence on the rate. At constant [FeII]0, the rate of dissolution is maximum when the ratio of [EDTA]0 to [FeII]0 is close to 3. These results are interpreted in terms of fast solution and surface complexation processes followed by slow heterogeneous electron transfer from adsorbed FeY2− to surface >FeIII centers and fast phase transfer of >FeII. The inhibitory effect of excess EDTA results from competitive adsorption of FeY2− and EDTA. The rate increases with decreasing pH up to pH 3.1; at this value a maximum is achieved. The pH dependence of rate is the resultant of several factors, the most important being the influence of pH on the adsorption preequilibrium and the need for adsorbed protons adjacent to the reactive site. The stoichiometry of the dissolution reaction is not constant and the ratio of protons consumed to iron released is sensitive to experimental conditions. In the fatest reactions, this ratio is appreciably lower than the limiting value corresponding to the release of unhydrolyzed FeIII species. The implications of this result are discussed." @default.
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• W2000701135 date "1989-07-01" @default.
• W2000701135 modified "2023-10-11" @default.
• W2000701135 title "Reductive dissolution of magnetite by solutions containing EDTA and FeII" @default.
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• W2000701135 doi "https://doi.org/10.1016/0021-9797(89)90109-4" @default.
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