Cesium ion-selective electrodes based on 1,3-alternate thiacalix[4]biscrown-6,6 |
| |
Authors: | Choi Youngsun Kim Hasuck Lee Jae Kwang Lee Seong Ho Lim Heung Bin Kim Jong Seung |
| |
Institution: | a School of Chemistry, Seoul National University, Seoul 151-747, South Korea b Department of Chemistry, Konyang University, Nonsan 320-711, South Korea c Department of Chemistry, Institute of Nanosensor & Biotechnology, Dankook University, Seoul 140-714, South Korea |
| |
Abstract: | Four thiacalix4]biscrown ethers with 1,3-alternate conformation were examined for the potentiometric responses in poly(vinyl chloride) membrane electrodes. Their potentiometric selectivities toward potassium and cesium ions over other alkali, alkaline earth, and transition metal ions were measured by the fixed interference method (FIM). Among the ionophores, 1,3-alternate thiacalix4]biscrown-6,6 showed a high selectivity for cesium over potassium ion and so was optimized as a Cs+-selective electrode. The electrode exhibited a linear response with a near Nernstian slope of 57.6 mV per decade in the concentration range of 1.0×10−6 to 3.2×10−2 M. It was suitable for use in aqueous solution in a wide range of pH 2.5-12.5 and had a fast response time of ca. 5 s. On the basis of 1,3-alternate thiacalix4]biscrown-6,6, the electrode has a wide linear range and selectivity for cesium ion over potassium ion better than those previously reported with other ionophores. |
| |
Keywords: | Thiacalix[4]biscrown ethers Cesium ion-selective electrode Potentiometry |
本文献已被 ScienceDirect PubMed 等数据库收录! |
|