Abstract
Extraction separation and concentration of Cs and Sr from aqueous solutions, containing macroconcentrations of competitive ions (Li+, Na+, K+, Mg2+, Ca2+, Al3+, Fe3+) by the nitrobenzene solutions of bis-1,2-dicarbollylcobaltate in the presence of linear and cyclic polyoxonium compounds (POC) has been investigated. It has been found, that the addition of DB18C6 increases the distribution ratio of cesium (Dcs) but the addition of other crowns and PEG decreases DCs value and selectivity of DSr and the selectivity of Sr/Ca separation. Separation factors of Sr/Ca increase from α(Sr/Ca)≈2 (found in the absence of POD) to α(Sr/Ca)≈50 (for DB18C6), α(Sr/Ca)≈100 (for 18C6 and DCH18C6) and α(Sr/Ca)≈1000 for 15C5.
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