Review of Pb availability and toxicity to plants in relation with metal speciation; role of synthetic and natural organic ligands

► Biogeochemical behavior of Pb strongly depends on its chemical speciation. ► Organic ligands modify Pb speciation and in turns, its biogeochemical behavior. ► Effect of organic ligand on Pb behavior vary with soil characteristics. ► Efficiency of organic ligands to modify Pb behavior vary with their binding capacity.