Temperature effects on the iron oxidation kinetics of a Leptospirillum ferriphilum dominated culture at pH below one

In this study, ferrous iron oxidation rates of a Leptospirillum ferriphilum dominated culture were determined over the temperature range of 2-50 degrees C at pH below one. The results show that at pH 0.9 the culture oxidizes iron within the temperature range of 10 degrees C to 45 degrees C. Using the Arrhenius equation, an E, value of 89.9 +/- 6.75 kJ/mol was calculated. From the data fitted to Ratkowsky Equation, the optimum, minimum and maximum temperatures were 35 +/- 1.5, 9.96 +/- 1.72 and 42.93 +/- 0.64 degrees C for this culture, respectively. The redox potential of the solution becomes more positive, which was the maximum (650-700 mV) at temperatures between 19-40 degrees C due to completing biological oxidation and increasing in ferric iron concentration.