Fig. 3. (A) Percentage of PO₄ sorption from a 1.6 mM PO₄ solution and percentage of SO₄ sorbed from a 1.6 mM SO₄ solution plotted against reactive Al and Fe (expressed as Al_o + Fe_o; units in mmol kg^-1). (B) Percentage of PO₄ sorption from 16.1 mM PO₄ solution plotted against reactive Al and Fe (expressed as Al_o + Fe_o; units in mmol kg^-1).

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