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为提高冠醚类,中性载体锂离子选择性电极的选择性和灵敏性以扩大其‘应’用,合成了一系列苯并12—冠—4和二苯并14—冠—4及其衍生物,分别以它们为活性物质,选择多种溶剂研制成PVC膜锂离子选择性电极,进行测定比较其性能,结果表明,以3′—(正辛氧甲基)苯并12—冠—4为活性物质,磷酸三丁酯为溶剂的PVC膜锂离子电极的性能较好、它的Nerust线性响应浓度范围为1.0×10~(-4)—1.0×10~(-1)mol/L,平均响应斜率为68.4mV/dec.(18℃);对碱金属和碱土金属离子的选择均很好,如:K_(Li~+)~(pot),Na~+为8.9×10~(-4)
In order to increase the selectivity and sensitivity of the crown ethers, neutral carrier lithium-ion selective electrodes to expand their use, a series of benzo-12-crown-4 and dibenzo-14-crown-4 (N-octyloxymethyl) benzo-12-crown-3 (PVC) membrane electrode were prepared by using a series of solvents as the active material and a variety of solvents. 4 as active material and tributyl phosphate as solvent, its Nerust linear response concentration ranged from 1.0 × 10 -4 to -1.0 × 10 -1 mol / L , And the average response slope was 68.4mV / dec. (18 ℃). The selection of alkali metal and alkaline earth metal ions were good, such as K_ (Li ~ +) ~ (pot), Na ~ + 8.9 × 10 ~ -4)