LEAD, CADMIUM, AND ZINC BIS-(DIETHYLDITHIOCARBAMATE) AND DIETHYLDITHIOCARBAMIC ACID AS REAGENTS FOR LIQUID-LIQUID-EXTRACTION

The extraction constants of Pb(DDC)2, Cd(DDC)2, Zn-(DDC)2—where DDC is used to denote the diethyldithiocarbamate anion—were determined for the system H2O/CHCI3; log Km was found to be 7.94±0.09, 5.77±0.05, 2.39±0.02. Solutions of Cd(DDC)2 and Zn(DDC)2 in CHCI3 were shown to be stable for at least 40 days. When solutions of Cd(DDC)2, Zn(DDC)2, or HDDC as reagents in CHCI3 were used to extract acid aqueous solutions, their titer deteriorated as a function of pH and time; however, this deterioration is much less rapid than the destruction of a solution of NaDDC. The title compounds therefore can be considered suitable reagents for extractions from acid aqueous solutions. © 1979, American Chemical Society. All rights reserved.