Fig. 4. Effect of biosolids and organic carbon removal on Cd adsorption isotherms on Miamian silt loam (fine, mixed, active, mesic Oxyaquic Hapludalfs) at pH 5.5 in 0.01 M Ca(NO3)2 solution for (A) soils treated with 0, 90, or 300 Mg ha–1, or pure biosolids, and (B) inorganic fraction of soils treated with 0, 90, or 300 Mg ha–1, or pure biosolids.