Abstract
The liquid membrane transport of alkali metal cations (Li +, Na +, and K +) across a chloroform membrane was carried out using mixed carrier systems composed of bis(2-ethylhexyl)phosphoric acid (B2EHPA) and a series of crown ethers (dioxo-13-crown-4, 13-crown-4, benzo-14-crown-4, 15-crown-5, and benzo-18-crown-6 ethers) having (benzyloxy)methyl and (benzoyloxy)methyl groups. Substituted 15-crown-5 and benzo-18-crown-6 derivatives/B2EHPA mixed carriers showed significantly enhanced transport rates of Li + and Na + compared with those of 15-crown-5/B2EHPA and benzo-18-crown-6/B2EHPA. It was revealed that the introduction of a side arm such as the (benzoyloxy)methyl group to the crown ring easily modified the selectivities of the alkali metal cations in these mixed carrier systems.
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