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A. A. Abramov, O. V. Dubovaya, S. V. Volkova
Interference of elements at extraction by macrocyclic
extractants
Abstract
Extraction
of cations of some alkali and alkali-earth metals as well as Pb(II), Rh (III)
and Pd (II) by crown-, thiocrown- and azacrown ethers from picric and nitric
acid solutions was studied. At extraction of metal cations by macrocyclic
extractants in polar solvents, an interference of these cations on the
extraction of each other is observed. Reasons of this phenomenon were
disclosed, and the mechanism of extraction supression of microcomponent by
macrocomponent was assumed. It is shown for the first time that during
simultaneous extraction of Am(III) and Eu(III) by calixarenes their
co-extraction takes place. The latter results in a good extraction of Am(III)
from nitric acid solutions. We made a hypothesis on the formation of mixed
nitrate complex of americium and europium that is effectively extracted by
calixarenes in the organic.
Copyright (C) Chemistry Dept., Moscow State University, 2002
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