EXTRACTION OF HEAVY METALS FROM CONTAMINATED SOILS: I. SEQUENTIAL EXTRACTION IN SURFACE SOILS AND THEIR RELATIONSHIPS TO DTPA EXTRACTABLE METALS AND METAL PLANT UPTAKE

摘要

This study was aimed to evaluate the quantity and bioavailability of five metals from five contaminated soils. A selective sequential fractionation procedure was used to separate the metals into six groups: water soluble, exchangeable, carbonate, Fe-Mn oxide, organic, and residual. The residual fraction was the most abundant Only for Pb in most soils, suggesting that Pb was probably more stable and less Bioavailable in these soils. Lead, Cd, and Cu were not detected in the water-soluble Fraction of most soils.