Sorption of Fulvic Acids and Their Compounds with Heavy Metal Ions on Clay Minerals

In real soils the interaction of humic substances with clay minerals often occurs participation metal cations. The adsorption fulvic acids (FA) solution and their solutions in presence heavy ions (Pb or Zn) on two (kaolinite bentonite) was investigated by measurement optical density changes equilibrium solutions. FA bentonite at concentrations 0.05–1 g/L proceeds according to polymolecular mechanism has a stepwise character. kaolinite can be described monomolecular adsorption. three-component systems, including FA, trace element mineral, complex processes occur, formation complexes salts sorption colored Pb surface increases increasing (0.5–2 mmol/L). FA-Zn2+ compounds is more complicated process—adsorption takes place lowest concentration used only. Thus, binding cations phenomenon due chemical heterogeneity different properties metals, characteristics mineral surfaces variability environmental conditions.