Supercritical Fluid Extraction of Trace Metals from Solid and Liquid Materials for Analytical Application

Abstract

etal ions in solid and liquid materials can be extracted by supercritical CO₂ containing a suitable ligand. Bis(trifluoroethyl)dithiocarbamate is an effective ligand for the extraction of transition metals and non-metals in supercritical CO₂. Fluorinated β-diketones and tributyl phosphate in supercritical CO₂ 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 CO₂.