Abstract
Metal ions in solid and liquid materials can be extracted by supercritical CO 2 containing a suitable ligand. Bis(trifluoroethyl)dithiocarbamate is an effective ligand for the extraction of transition metals and non-metals in supercritical CO 2 . Fluorinated β-diketones and tributyl phosphate in supercritical CO 2 exhibit a positive synergistic extraction for the lanthanides and actinides from solid and liquid samples. Triazole containing crown ethers can also be used for selective extraction of heavy metals in supercritical CO 2
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