Collect. Czech. Chem. Commun. 1998, 63, 338-346

Extraction of 133Ba with Bis[undecahydro-7,8-dicarbaundecaborato(2-)]cobaltate(1-) in the Presence of Dibenzo-18-crown-6

Petr Vaňuraa and Emanuel Makrlíkb

a Department of Analytical Chemistry, Prague Institute of Chemical Technology, 166 28 Prague 6, Czech Republic
b Faculty of Education, Charles University, 116 39 Prague 1, Czech Republic


Extraction of barium with the nitrobenzene solution of bis[undecahydro-7,8-dicarbaundecaborato(2-)]cobaltate(1-) in the presence of dibenzo-18-crown-6 (DB18C6, L) has been investigated. The equilibrium data and typical maxima in the dependences of the Ba distribution ratios on the analytical concentration of DB18C6 in the system can be explained assuming that the species Ba2+, BaL2+, BaL22+, BaHL3+ and BaHL23+ to be extracted into the nitrobenzene phase. The values of extraction and stability constants of the species in nitrobenzene saturated with water have been determined.

Keywords: Water-nitrobenzene extraction system; Barium; Crown ethers; Dibenzo-18-crown-6; Carboranes; Bis-1,2-dicarbollylcobaltate.