Fig. 7 Release of organic carbon (OC) sorbed on amorphous Al(OH)₃ and goethite by 0.1 M Na₂SO₄ and 0.1 M NaH₂PO₄ at different times after the sorption. The time given on the x-axis is the residence time of the OC on the sorbent prior to the desorption. Error bars represent the standard deviation of three replicates