Solvent extraction of cesium into nitrobenzene by using sodium, potassium and rubidium dicarbollylcobaltates in the presence of polypropylene glycol PPG 425

Abstract

Extraction of microamounts of cesium by nitrobenzene solutions of sodium dicarbollylcobaltate (Na+B−), potassium dicarbollylcobaltate (K+B−) and rubidium dicarbollylcobaltate (Rb+B−) in the presence of polypropylene glycol PPG 425 (L) has been investigated. The equilibrium data have been explained assuming that the complex species ML+ (M+ = Na+, K+, Rb+, Cs+; L = PPG 425) are present in the organic phase. The stability constants of the cationic complex species ML+ (M+ = Na+, K+, Rb+) in nitrobenzene saturated with water have been determined; they were found to increase in the series of Rb+ < K+ < Na+.