In the first experiment, a pH of 2.0 resulted in the highest production of iron(III) through the Fenton reaction (Figure ). The Fe 3+ concentration in this pH was 0.0222 mM after 10 minutes of the reaction. At a pH of 3.0, the concentration of Fe 3+ was 0.018 mM (Table ). At both a pH of 2.0, the highest concentrations of Fe 3+ were produced, indicating that oxidation of iron(II) through the Fenton reaction is optimal under these conditions. At a pH lower than 2 and greater than 6, concentrations of iron(III) dropped significantly. This data corroborates previous research by Abdur-Rahim A. Giwa .