Metal extraction from the artificially contaminated soil using supercritical CO2 with mixed ligands.
Supercritical fluids have good penetrating power with a high capacity to dissolve certain solutes in the fluid itself, making it applicable for soil cleaning. Supercritical CO2 along with mixed ligands has been used for cleaning artificially contaminated soil. The extraction of metal from the soil was successful, and the molar ratio of ligands to the extracted metal was as low as 3. Complicated structures with a large surface area of the real soil seemed to cause the lower efficiency. Reduced efficiency was also observed over time after the sample preparation, indicating the possibility of chemisorption of the metal ion onto the soil. The use of supercritical CO2 with dissolved mixed ligands was sufficient to extract metal from the soil.
Department of Nuclear Engineering, Kyung Hee University, Yongin, South Korea. kpark@khu.ac.kr
Kwangheon
K
Park
Jeongken
J
Lee
Jinhyun
J
Sung
D002245:Carbon Dioxide / Q000737:chemistry*; D005591:Chemical Fractionation / Q000379:methods*; D025924:Chromatography, Supercritical Fluid; D008024:Ligands; D008670:Metals / Q000032:analysis* / Q000737:chemistry; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis* / Q000737:chemistry
D008024:Ligands; D008670:Metals; D012987:Soil; D012989:Soil Pollutants; D002245:Carbon Dioxide