琥珀酰胆碱离子在水/邻硝基苯甲醚界面的伏安行为及其离子电极的研究

由于琥珀酰胆碱离子(Sch²⁺)在水(w)和邻硝基苯甲醚(NA)界面的传递半积分半微分循环伏安波与常规新极谱波的特性相似,测定了Δ_w^oφ_1/2、响应斜率、n和D_Sch^w2+.据此制备了以四苯硼琥珀酰胆碱Sch(TPB)₂]为活性材料、邻硝基苯甲醚和邻苯二甲酸二丁酯(DBPH)为混合溶剂的Sch²⁺-PVC液膜电极.电极特性与Sch²⁺离子在w/NA界面传递所预示的结果相似.试验了电极对某些离子的选择性系数和回收率.

Study of Voltammetric Behaviour at Water/ο-Nitroanisole Interface and Ion Selective Electrode for Succinylcholine Ion

In the system of 1 mol/L MgCl₂ (w)-0.01 mol/L TBATPB(NA), the “potential window” of the polarized interface was shifted about 200 mVto the anodic potential as compared with nitrobenzene used as oil phase.For succinylcholine ion, the characteristics of semi-integral and semi-differential cyclic voltammograms were similar to those of normal neopolarograms.Δ_w^oφ_1/2.Nernst slope, n and D_Sch^w2+ are 110 mV, 28.2 mV, 2 and 2.3×10^-6cm²/s, respectively.The properties of ISEfor succinylcholine ion prepared from Sch(TPB)₂ and the solvent mixed ο-nitroanisole and dibutylphthalate are the same as those of ITIESof succinylcholine ion.These results prove that the boundary potential difference of the electrode is due to the diffusion and transfer of succinylcholine ion at PVCinterface.The linear range is from 4.0×10^-6 to 1.0×10^-3 mol/Land the detection limit is 2.0× 10^-6 mol/L.