Abstract: 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.

Key words: Succinylcholine, Electrolysis at oil/water interface, Ion selective electrode, Neopo-larography