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近年来,我们在选用碱性染料研制PVC膜电极的过程中发现,以丁基罗丹明B为大阳离子制成的数种离子缔合型一价络阴离子电极性能良好,尤其是制作碳棒涂膜式PVC膜电极效果极佳。在此基础上,我们初步试制成功了碳棒涂膜式PVC膜MnO_4~-电极,电极线性范围1×10~(-2)～1×10~(-6)M,级差为53mV/1pC(20℃),检测下限7.1×10~(-7)M。与文献报道的液膜和PVC膜高锰酸根电极相比,该电极制作简单,使用方便,性能良好,可用于水相中MnO_4~-的直接测定和电位滴定的指示电极。
In recent years, we selected basic dyes in the development of PVC membrane electrode process found that butyl rhodamine B as a large cation made of several ion-association monovalent anion anion performance, in particular, is the production of carbon rod coating Membrane PVC membrane electrode excellent results. On this basis, we successfully fabricated the carbon rod-coated PVC membrane MnO_4 ~ - electrode with a linear range of 1 × 10 -2 ~ 1 × 10 -6 M with a step of 53mV / 1pC 20 ℃), the detection limit of 7.1 × 10 ~ (-7) M. Compared with the reported membrane and PVC membrane permanganate electrode, the electrode is simple, easy to use, and has good performance. It can be used as direct electrode for potential measurement and potentiometric titration of MnO_4 in aqueous solution.