Fig. 1 Sorption of organic carbon (OC) to amorphous Al(OH)₃, goethite, and the 3Bw horizon of an Oxyaquic Dystrochrept and the subsequent desorption by a solution of the same inorganic composition as the sorption solutions but without dissolved organic carbon (DOC). Sorption is given as the relationship between added and sorbed OC (initial pH = 4.0; ionic strength = 0.002 M)