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用作PVC膜阳离子选择性电极的中性载体中,双冠醚是一类极有发展前途的化合物。例如,用三嗪环桥链的双冠醚制成的PVC膜钾电极对钾离子的配合能力为钠离子的几千倍,为NH_4~+离子的几百倍。为了进一步研究双冠醚的结构对电极性能的影响,我们合成了三种Shiff碱型双冠醚和三种仲胺型双冠醚,用它们制成PVC膜钾离子选择性电极,测量了碱金属和碱土金属离子的选择系数,发现这两类双冠醚钾电极对钠离子的选择系数几乎都在10~(-4)左右。
Among the neutral carriers used as PVC membrane cation-selective electrodes, bis-crown ethers are a promising class of compounds. For example, the PVC membrane potassium electrode made with the bis-crown ether of the triazine ring bridge has several thousand times the capacity of the potassium ions for sodium ions, which is several hundred times that of NH 4 + ions. In order to further study the effect of the structure of bis-crown ethers on the performance of the electrode, we synthesized three Shiff-based bis-crown ethers and three kinds of secondary amine-type bis-crown ethers. They were used to make PVC membrane potassium ion selective electrodes. The selection coefficients of metal ions and alkaline earth ions show that the selectivity coefficients of these two kinds of sodium dodecyl ether are about 10 ~ (-4).