Fig. 2. (A) Amounts of AsO4 (expressed as percentages of AsO4 fixed in the absence of PO4; Table 3) sorbed on goethite and gibbsite in the presence of increasing concentration of PO4. (B) Amounts of PO4 (expressed as percentages of PO4 fixed in the absence of AsO4; Table 3) sorbed on goethite and gibbsite in the presence of increasing concentration of AsO4.