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采用正交设计研究了在中性载体聚氯乙烯（ＰＶＣ）膜中，离子缔合物的种类、浓度及增塑剂３个因素对电极性能的影响。制备了性能稳定的石墨内导膜电极。在ｐＨ１．０～５．５之间电极电位基本稳定，线性范围为１．０×１０－２ｍｏｌ／Ｌ～２．０×１０－５ｍｏｌ／Ｌ，检测下限可达２．５×１０－６ｍｏｌ／Ｌ并能直接应用于原料药和制剂含量的测定。
The orthogonal design was used to study the influence of three factors of ion association on the performance of PVC in neutral carrier polyvinyl chloride (PVC) membrane. A graphite inner guide electrode with stable performance was prepared. The electrode potential was stable at pH1.0 ~ 5.5 with a linear range of 1.0 × 10-2mol / L ~ 2.0 × 10-5mol / L and the detection limit of 2.5 × 10-6mol / L and can be directly applied to the determination of APIs and preparations.