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- E-ISSN 2288-8985
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Solvent Extraction of Alkali Metal and Alkaline Earth Metal Cations Using a Mono-Crown Ether and Bis-(Crown Ether)s
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
1997, v.10 no.1, pp.60-65
Shin,
Y., &
Kim,
H.
(1997). Solvent Extraction of Alkali Metal and Alkaline Earth Metal Cations Using a Mono-Crown Ether and Bis-(Crown Ether)s. Analytical Science and Technology, 10(1), 60-65.
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Abstract
Solvent extraction of alkali metal and alkaline earth metal cations by mono-crown ether(benzo-15-crown-5) and bis-(crown ether)s(ethylenediamine bis(4'-formyl benzo-15-crown-5)) containing benzo-15-crown-5 moieties were investigated with water-chloroform system at <TEX>$25^{\circ}C$</TEX>. The order of the extraction equilibrium constants(<TEX>$K_e$</TEX>) and the complexation constants(<TEX>$K_c$</TEX>) for the alkali metal and alkaline earth metal cations with mono-crown ether and bis-(crown ether)s were Ca(II)>Na(I)>Sr(II)>K(I)>Mg(II)>Rb(I) and Sr(II)>Ca(II)>K(I)>Rb(I)>Mg(II)>Na(I) respectively. These results were explained in terms of the size effect of metal cation and electron density effect. Also, the bis-(crown ether)s was found to extract metal cations more effectively than the corresponding mono-crown ether.
- keywords
- solvent extraction, mono-crown ether, bis-(crown ether)s, extraction equilibrium constants(<TEX>$K_e$</TEX>), complexation constants(<TEX>$K_c$</TEX>)
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