Effect of EDTA on heavy metals sorption onto soil
Artificial contamination with heavy metals (up to 50mg/kg) of sod-podzolic agricultural soil is performed; mobile and acid soluble fractions of Cu(II), Pb(II), Cd(II) are determined. Metal extraction from contaminated soil with EDTA aqueous solution at pH=2-10 is studied. It is established that amounts of extracted metals were 60-95% of total Cd(II) and Cu(II) content and only 3-33% of total Pb(II). EDTA-induced remobilization is decreased in the metal sequence Cd(II) > Cu(II) >> Pb(II). Maximum efficiency of metal extraction is observed at pH=4. Application of EDTA for heavy metal removal from natural sediments is discussed.