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刘永明曾以十二烷基三辛基碘化铵为活性材料制成 PVC 膜电极,但其线性范围较窄,灵敏度较低,仅10~(-4)M。本文以十六烷基三辛基碘化铵为活性物质,以邻苯二甲酸二丁酯为增塑剂研制的邻苯二甲酸氢钾 PVC 膜电极线性范围为1.0×10~(-1)—7.0×10~(-6)M,斜率60mV,重现性、稳定性良好,响应快,灵敏度较高,检测限3.2×10~(-6)M。以该电极为指示电极,用自动电位滴定法标定 NaOH,简便、快速,结果满意。
Yong-Ming Liu had dodecyl trioctyl ammonium iodide as the active material made of PVC membrane electrode, but its linear range is narrower, lower sensitivity, only 10 ~ (-4) M. In this paper, cetyltrioctylammonium iodide as active material, dibutyl phthalate as plasticizer developed by potassium hydrogen phthalate PVC membrane electrode linear range of 1.0 × 10 ~ (-1) -7.0 × 10 ~ (-6) M, the slope of 60mV, reproducibility, good stability, fast response, high sensitivity, detection limit of 3.2 × 10 ~ (-6) M. Using the electrode as the indicator electrode, NaOH was calibrated by automatic potentiometric titration. It was simple, rapid and satisfactory.