Abstract
The extraction of 22Na, 45Ca, 85Sr and 133Ba by the nitrobenzene solution of bis-1,2-dicarbol-lylcobaltate has been investigated and the influence of the presence of various substituted and unsubstituted crown ethers was shown. Extraction of alkali earth ions in absence of crown ethers increases in the sequence Mg2+<Ca2+<Sr2+<Ba2+ but the difference of values of the exchange extraction constants between Mg2+ and Ba2+ is less than one order of magnitude. The presence of 15-crown-5 increases both, the distribution ratio and the mutual extraction selectivity of alkali earth metals. The logarithm of the synergistic factor for calcium is log S=3.1, for strontium log S =6.0 and for barium log S=7.4. The extraction of Na+ in the nitrobenzene −bis-1,2-dicarbol-lylcobaltate system is low. The addition of DCH18C6 has a little effect on the distribution ratio of sodium (synergistic coefficient S=2). On the other hand, the addition of BD18C6, with almost the same diameter of a cavity as DCH18C6 causes the increase of the distribution ratio of sodium to S=500. This difference is caused by the competition of H+ ions. The distribution ratio of sodium in the system with 15C5 is almost the same as with DB18C6. A maximum on the D(Na) vs. c(15C5) dependence has been found.
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