Abstract
Liquid-liquid extraction of cesium (spiked with 137Cs isotope) with 18-crown-6 in nitrobenzene solvent is diminished in presence of various phosphine oxides, namely, tri-n-octylphosphine oxide (TOPO), tri-n-butylphosphine oxide (TBPO), and triphenylphosphine oxide (TPPO). Formation of an electron donor-acceptor complex between the crown ether and phosphine oxides is assumed, making the crown ether less available for cesium extraction. The formation constants of the complexes were determined by UV-VIS spectrophotometry.
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