Selective Recognition of Calcium Ion through Liquid Membrane |
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| Authors: | Jong Seung Kim Moon Hwan Cho Sang Chul Lee Kyung Bok Lee Wonbo Sim Jae Hyung Yoo |
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| Institution: | aDepartment of Chemistry, Konyang University, Nonsan, 320-711, Korea;bDepartment of Chemistry, Kangwon National University, Chuncheon, 200-701, Korea;cKorea Atomic Energy Research Institute, Taejon, 305-600, Korea |
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| Abstract: | The mole transport rate of alkaline earth metal ions through a bulk liquid membrane and a supported liquid membrane using a series of proton diionizable acyclic polyethers was measured. Among alkaline earth metal ions, the calcium ion was observed to be selectively transported in both single and competitive transport experiments. Potentiometric titration and solution calorimetric titration also gave calcium selectivity over other alkaline earth metal ions. Acyclic polyether bearing a diethylene glycol unit andn-tetradecyl lipophilic chain at the α position of carboxylic acid affords the best selectivity for the calcium ion in bulk and supported liquid membranes. |
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