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Fig. 2. Influence of pH on organic-acid induced P release from ferrihydrite (A) and goethite (B). Experimental conditions: 7.14-g oxide L^–1, 1/4 of P-adsorption maximum, 0.0357 M organic acid, and 28-min reaction at room temperature. Each bar represents the mean of three or more replications, with error bars representing standard error. Different letters represent significant differences by Tukey's at ${alpha}$ = 0.05.