Adsorption and Release of Heavy Metals in Contaminated Soil

by Camille Connick, US EPA, Boston, MA, USA,
Frederick Blanc, US EPA, Boston, MA, USA,
James O'Shaughnessy, US EPA, Boston, MA, USA,

Document Type: Proceeding Paper

Part of: Environmental Engineering


This study investigated the adsorption and release rates of toxic metals in soil type associated with hazardous waste sites common to the Northeastern United States. Five heavy metals (Cd, Cu, Pb, Ni and Zn) were evaluated using shaker table isotherm tests and soil column exchange results. Results indicated that the Freundlich Isotherm was applicable for the description of the behavior of all the soil/metal systems. Cadmium, nickel and zinc adsorption rates were approximately equal, and less than the adsorption rate for lead. Copper exhibited a lower rate than the other metals. Column test results indicated that in-situ treatment is a viable option for the removal of these metals from this soil type. Clean water and clean water with surfactant were equally effective in the removal of metals. The use of the chelating agent Disodium EDTA increased metal removal rates, requiring a smaller total rinse volume. (Edited author abstract. )

Subject Headings: Soil pollution | Metals (chemical) | Adsorption | Heavy metals | Alloys | Site investigation | Soil classification | Occupational safety | United States

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