... 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. ... It is shown for the first time that during simultaneous extraction of Am(III) and Eu(III) by calixarenes their co-extraction takes place. ... Moscow University Chemistry Bulletin . 2009, Vol. ... 5, P. 341 . ...