SUPERCRITICAL-FLUID EXTRACTION OF TRACE-METALS FROM SOLID AND LIQUID MATERIALS FOR ANALYTICAL APPLICATIONS

Metal ions in solid and liquid materials can be extracted by supercrit ical CO2 containing a suitable ligand. Bis(trifluoroethyl)dithiocarbam ate is an effective ligand for the extraction of transition metals and non-metals in supercritical CO2. Fluorinated beta-diketones and tribu tyl phosphate in supercritical CO2 exhibit a positive synergistic extr action for the lanthanides and actinides from solid and liquid samples . Triazole containing crown ethers can also be used for selective extr action of heavy metals in supercritical CO2.