Transport and Retention of Cd, Cu and Pb in Soils: Miscible Displacement Experiments.

In this study we quantified Cd, Cu and Pb transport and retention in three soils having distinctly different properties.  The second objective was to quantify Cd, Cu and Pb retention kinetics in the different soils. We quantified the influence of Pb additions on Cd and Cu affinities over time. Miscible displacement experiments under steady flow conditions were used to quantify the extent of the mobility of the different heavy metals in soil columns. Effluent breakthrough results for consecutive and concurrent pulses of Cd, Cu and Pb were obtained for each soil. Kinetic batch experiments were used to quantify time dependent retention during adsorption and desorption of Cd, Cu and Pb. Experimental measurements were described based on a multireaction nonlinear model incorporating equilibrium and kinetic reactions with the solute transport equation.