9-冠-3衍生物载体锂离子选择性电极

Lithium Ion-selective Polymeric Membrane Electrode Based on 9-Crown-3 Derivatives

报道了两种９－冠－３衍生物的合成，并以合成的化合物作载体研制了对锂离子响应的ＰＶＣ膜电极。以乙基－９－冠－３为载体的锂离子电极的能斯特响应为１０×１０－１～５２×１０－５ｍｏｌ／Ｌ，斜率为（５７４±０３）ｍＶ／ｐ［Ｌｉ］（２５℃），检测下限为２４×１０－５ｍｏｌ／Ｌ。电极具有良好的稳定性和重现性，用于实际样品测定。

Two kinds of 9_crown_3 derivatives were synthesized.A lithium ion_selective polymeric membrane electrode based on the synthesized 9_crown_3 derivatives was described.The electrode doped with ethyl_9_crown_3 showed a Nernst potentiometric response for Li with the concentration between 5 2×10 -5 and 1 0×10 -1 mol/L and a slope of (57 4±0 3) mV[WTB2]/p(25℃).The detection limit was 2 4×10 -5 mol/L and good stability and reproducibility were observed.The electrode was applied to the determination of lithium in some bittern samples and satisfactory results were obtained.