Abstract
The kinetics of ferrous iron oxidation mediated by Thiobacillus ferrooxidans was studied in aerobic acidic conditions. Reaction rates, measured as oxygen uptake rates, were investigated in a wide range of Fe2+, H+, Ni2+ and Cu2+ concentrations. For both, ferrous iron and hydrogen ion, the substrate activation, as well as substrate inhibition of the bacterial iron oxidizing activity was observed. Nickel and cupric sulphates inhibited bacterial oxidation of ferrous iron non-competitively. Resting cells of the examined Thiobacillus ferrooxidans strain possess quite large resistance to nickel (K1 = 233 mM) and copper (K1 = 343 mM). A considerable catalytic effect of cupric ion to the abiotic iron (II) oxidation has been observed.
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