Key words: supercritical fluid, liquefied gas, carbon dioxide, extraction, radionuclides
The work is devoted to a comparison of extraction processes of metals macro- and microquantities by complexon solutions in supercritical (SC) and liquid CO2. It is demonstrated that in the most cases the regularities of liquid-liquid extraction also serve in extraction by liquid and SC-CO2. The differences between the extraction by "traditional" solvents and by carbon dioxide is mostly kinetic due to a much lower viscosity of the latter in both liquid and SC states. The specific features of metal SFE become significant only in the case of extraction of microquantities.