Fig. 4. Initial rate of dissolved Mn(II) release measured by the EPR-SF technique as a function of: (A) [CAT] at pH 4 and 0.90 m² L^-1 [SA]; (B) [SA] at pH 4 and 5 (10^-3 M [CAT]; and (C) [H⁺] at 0.90 m² L^-1 [SA]. The dotted lines represent the 95% confidence interval bands

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