Department of Chemistry, Zhengzhou University, Zhengzhou, Henan 450052, People's Republic of China.
Talanta. 2002 Apr 22;57(1):81-8. doi: 10.1016/s0039-9140(02)00002-4.
A new tripodal compound, 1,1,1-tris(N-ethyl-N-phenylamino-carboxylmethoxymethyl) propane, has been synthesized and evaluated as an ionophore in PVC membrane electrode for the analysis of alkali and alkaline earth metal cations. The influence of the nature of the plasticizers (o-NPOE, DBP and DOP) and of the amount of incorporated ionophore on the characteristics of the electrode was discussed. Selectivity coefficients against alkali and alkaline earth metal cations were calculated. The electrodes based on the tripodal compound with o-NPOE and DBP as plasticizer gave good performance (slope, limits of detection) to lithium and sodium ions. The electrode plasticized with o-NPOE also exhibited near-Nernstian response to divalent ions: Ca(2+), Sr(2+) and Ba(2+). The electrode prepared with 3.9 mg ionophore, 185 mg o-NPOE, 92 mg PVC and 0.46 mg KTpClPB can be used as a Ca(2+) electrode. The influence of pH has also been studied. The electrodes exhibited better potential stability and operational lifetime of more than 3 months.
一种新的三足化合物，1,1,1-三（N-乙基-N-苯基氨基-羧甲氧甲基）丙烷，已被合成并评估为 PVC 膜电极中用于分析碱金属和碱土金属阳离子的离子载体。讨论了增塑剂（邻硝基邻苯二甲酸二乙酯、邻苯二甲酸二丁酯和邻苯二甲酸二辛酯）的性质和掺入的离子载体的量对电极特性的影响。计算了对碱金属和碱土金属阳离子的选择性系数。基于邻硝基邻苯二甲酸二乙酯和邻苯二甲酸二丁酯作为增塑剂的三足化合物的电极对锂离子和钠离子具有良好的性能（斜率、检测限）。用邻硝基邻苯二甲酸二乙酯增塑的电极对二价离子：Ca(2+)、Sr(2+) 和 Ba(2+) 也表现出近能斯特响应。用 3.9mg 离子载体、185mg 邻硝基邻苯二甲酸二乙酯、92mg PVC 和 0.46mg KTpClPB 制备的电极可用作 Ca(2+) 电极。还研究了 pH 的影响。这些电极表现出更好的电位稳定性和超过 3 个月的工作寿命。
