Fig. 2
From: The influence of environmental conditions on kinetics of arsenite oxidation by manganese-oxides
Effect of pH on manganese As(III) oxidation: the influence of pH on the oxidation of 100 μM arsenite by 1.82 mM Mn δ-manganese-oxide (left) and acid birnessite (middle and right). The minerals were reacted with As(III) at pH 4.5, 7.2, and 9.0. The oxidation of As(III) by the manganese-oxide produces As(V)