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The oxidation of ferrous iron (Fe2+ ) to ferric iron (Fe3+ ) with dioxygen (O2 ) by various strains ofThiobacillus ferrooxidans was studied by measuring the rate of O2 consumption at various Fe2+ concentrations and cell concentrations. The apparentKm values for Fe2+ remained constant at different cell concentrations of laboratory strains ATCC 13661 and ATCC 19859 but increased with increasing cell concentrations of mine isolates SM-4 and SM-5. The latter results are explained by the competitive inhibition of the Fe2+ -binding site of a cell by other cells in the reaction mixture. Possible mechanisms involving cell surface properties are discussed.

Competitive Inhibition of Ferrous Iron Oxidation by Thiobacillus ferrooxidans by Increasing Concentrations of Cells