Abstract
Extraction of microamounts of calcium and strontium by a phenyltrifluoromethyl sulfone (FS 13) solution of hydrogen dicarbollylcobaltate (H+B−) in the presence of polyethylene glycol PEG 400 (L) has been investigated. The equilibrium data have been explained assuming that the species HL+, CaL2+ and SrL2+ (L = PEG 400) are extracted into the organic phase. The values of extraction and stability constants of the cationic complex species in FS 13 saturated with water have been determined. It was found that in water-saturated FS 13, the stability constant of the complex SrL2+, where L is PEG 400, is somewhat higher than that of the species CaL2+ with the same ligand L.
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