SOLUBILITY PARAMETERS AND SOLUBILITIES OF METAL DITHIOCARBAMATES IN SUPERCRITICAL CARBON-DIOXIDE

The solubilities of Cu, Hg, and Zn complexes with seven different dith iocarbamate ligands in supercritical fluid CO2 at 60 degrees C and two pressures (100 and 230 atm) are reported, In each metal chelate syste m, the solubility of the metal-dithiocarbamate complex shows a strong correlation with the solubility parameters of the ligands, calculated using a group contribution method, Dithiocarbamate ligands with smalle r solubility parameter values form metal complexes with higher solubil ities in supercritical CO2. The solubility parameter value may provide a general guideline for selecting effective ligands for metal extract ion in supercritical CO2.