Fig. 3 Kinetics of Mn dissolution in the reaction of catechol and birnessite at pH 4. Effects of second pulse of reactants [no additions (+0), catechol added (+C), birnessite added (+B) and both added (+BC)] at 5-h reaction time. Initial and second pulse catechol concentrations each provided 13.8 mmol C L^-1. Initial and second pulse birnessite concentrations each provided 1.0 g L^-1. Standard deviations are indicated

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