Studies of the Solvent Extraction of Cadmium and Silver Dithizonates

(From the Summary)

Studies of masked and non-masked extractions of cadmium and silver dithizonates have been made from aqueous solutions into various organic solvents containing dithizone. The term, masked extraction, was used to designate extractions from aqueous solutions containing chemical species which complex with the ions of silver and cadmium. The term, non-masked extraction, was applied to extractions from aqueous solutions containing the perchlorate ion which was assumed not to form complexes with the ions of silver and cadmium. Cadmium dithizonate extractions were made from aqueous solutions into chloroform, and silver dithizonate extractions were made from aqueous solutions into chloroform, carbon tetrachloride, dichloromethane, benzene, toluene, chlorobenzene, and bromobenzene. The initial compositions of the aqueous solutions varied with regard to hydrogen ion concentration, masking agent, and ionic strength; the initial concentrations of cadmium and silver ions remained constant at values of 7 x 10⁻⁵ M. and 1 x 10⁻⁷ respectively. The initial compositions of the organic solutions varied only with respect to the dithizone concentration.