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关于SCN~-离子选择电极的研制已见文献报道,其中以固态膜居多。本文以乙基紫—SCN~-缔合物为电活性物质、邻苯二甲酸二丁酯为增塑剂研制了PVC膜SCN~-选择电极,测试了它的性能。电极对SCN~-浓度在10~(-5)—10~0M范围内符合Nernst关系式;斜率为55mv/PSN;实际响应时间小于一分钟;在10~(-3)MSCN~-溶液中,适宜的pH值为4—12,连续测定90分钟,电位在±0.4mv间波动;电极内阻为10~6欧姆左右。主要干扰
The development of SCN ~ - ion selective electrode has been reported in the literature, of which the majority of solid film. In this paper, a PVC membrane SCN ~ - selective electrode was prepared by using ethyl violet-SCN ~ - association as electroactive material and dibutyl phthalate as plasticizer. Its performance was tested. In the range of 10 ~ (-5) -10 ~ 0M, the electrode pair has a Nernst relation with a slope of 55mV / PSN; the actual response time is less than one minute; Appropriate pH value of 4-12, continuous determination of 90 minutes, the potential fluctuation between ± 0.4mv; electrode resistance of about 10 ~ 6 ohm. Main interference