Figure 3. Kinetics of Pb adsorption/desorption on soils at pH 5.5: (A)Pb adsorption on soils with different SOM concentrations and flow rates (In fluent [Pb] = 480 mg L−1); and (B) Pb adsorption and desorption on the soil with 2.1% SOM at two flow rates. Soil particle concentration m = 93.8 g L−1. Solid lines are model calculations. Note that the results were plotted versus chamber volumes to normalize the effect of flow rates.