Journal
JOURNAL OF THE SERBIAN CHEMICAL SOCIETY
Volume 73, Issue 1, Pages 29-39Publisher
SERBIAN CHEMICAL SOC
DOI: 10.2298/JSC0801029A
Keywords
synergistic extraction; 8-hydroxyquinoline; dibenzo-24-crown-8; dibenzo-18-crown-6; lanthanides separation factors
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The liquid extraction of the 13 lanthanides with mixtures of 8-hydroxyquinoline (HQ) and crown ethers (S) dibenzo-18-crown-6 (DB18C6) and dibenzo-24-crown-8 (DB24C8) in 1,2-dichloroethane as a diluent from chloride medium at constant ionic strength mu = 0.1 was investigated. The composition of the extracted species was established as LnQ(3) with HQ alone and as LnQ(3).S in the presence of a crown ether. The values of the equilibrium constants were calculated. The addition of DB18C6 to the metal chelate system improved the extraction efficiency, while a weak synergistic enhancement was found when the metals were extracted with mixtures of HQ-DB24C8. The parameters of the extraction process were determined and the separation factors between two adjacent lanthanides(III) were calculated.
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