The extraction of strontium and barium with a solution of bis-1,2-dicarbollylcobaltate in nitrobenzene in the presence of 18-crown-6

A study was performed of the extraction of Sr and Ba in an aqueous solution of perchloric acid-18-crown-6-bis-1,2-dicarbollylcobaltate-nitrobenzene. It was found that the organic phase contains complexes of the MLorg2+ type (M=Sr2+, Ba2+) that are converted to ML2,org2+ when the concentration of crown (cL) is greater than the concentration of bis-1,2 dicarbollylcobaltate (cB). The values of the corresponding extraction constants, individual extraction constants and stability constants of the extracted species in the organic phase were determined. This system can be utilized for separation applications at concentrations where cL<cB. (author) 3 tabs., 4 figs., 13 refs