After the separation of soil solid from the adsorption equilibrium solution in the experiments for adsorption isotherms, 25 mL of 1.0 mol/L KNO3 solution was added to replace the adsorbed heavy metals.
After the separation of soil solid from the adsorptionequilibrium solution in the experiments for adsorptionisotherms, 25 mL of 1.0 mol/L KNO3 solution was addedto replace the adsorbed heavy metals.