Fig. 2. Removal efficiencies of Cd, Cr, Pb and Zn in contaminated soil over time (0–24 h) by washing with CA and FeCl3(A); removal efficiencies of Cd, Cr, Pb and Zn in contaminated soil at the first 4 hours (A, the inset graphic); effects of liquid : soil ratios on the removal efficiencies of heavy metals during composite washing (B).
