Figure 4. Kinetics of metal adsorption/desorption on the mono-dentate sites (Cp1), the bidentate and tridentate sites (Cp2), and thetotal soil sites (Cp) of the Matapeake soil (2.32% SOC) at pH 5.5. In fluent metal concentrations during adsorption: (A) [Zn] = 1.91 mgL−1, (B) [Cu] = 1.67 mg L−1, and (C) [Pb] = 481 mg L−1.