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Potassium ion-selective membrane electrodes based on 1,3-alternate calix[4]crown-5-azacrown-5 |
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| Authors: | Kim Sungeun Kim Hasuck Noh Kwan Ho Lee Seoung Ho Kim Sung Kuk Kim Jong Seung |
| Affiliation: | a School of Chemistry and Molecular Engineering, Center for Molecular Catalysis, Seoul National University, Seoul 151-742, South Korea b Department of Chemistry, Konyang University, Nonsan 320-711, South Korea c Department of Chemistry, Dankook University, Seoul 140-714, South Korea |
| Abstract: | A series of 1,3-alternate calix[4]azacrown ethers for which the monoaza and unsymmetrical crowned-azacrown with different side arms were examined as an ionophore for ion-selective polymeric membrane electrode toward potassium ion. Among them, the electrode based on calix[4]crown-5-azacrown-5 with a phenyl group exhibited near Nernstian response for K+ ions over a wide concentration range (1×10−5 to 1×10−1 M) with a limit of detection of 2×10−6 M. It has a fast response time of approximately 2-3 s and can be used for at least 2 months without observing any major deterioration. Selectivity coefficients indicated that interference from all common alkali, alkaline and transition metal ions was very small. |
| Keywords: | Potassium ion-selective electrode Calix[4]azacrown ether Potentiometric detection |
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