聚苯胺修饰铂丝电极为基体的尼古丁化学传感器

NICOTINE SENSOR BASED ON A PLATINUM WIRE ELECTRODE MODIFIED WITH POLYANILINE

以聚苯胺（ＰＡｎ）薄膜修饰铂丝电极为基体电极，将含有尼古丁－四苯硼钠的聚氯乙烯（ＰＶＣ）敏感膜涂渍于基体电极表面，制成全固态双膜尼古丁电极。在ｐＨ值为５．５～７．０范围内，对８．０×１０－６～１．０×１０－２ｍｏｌ·Ｌ－１的尼古丁水溶液有良好线性响应，斜率为５８ｍＶ·ｄｅｃ－１，检测下限为４．５×１０－６ｍｏｌ·Ｌ－１。该电极结构简单，稳定性好，可用于测定烟草和卷烟烟气粒相物中的尼古丁。

The preparation of a new nicotion chemical sensor based on a platinum wire electrode modified with polyaniline is reported. The basic electrode is a platinum wire electrode modified with a layer of polyaniline,then a layer of PVC membrane containing tetraphenylborate nicotine ion pair complex and plasticizer is coated on the surface of basic electrode. At pH 5.5～7.0,this electrode shows a rapid and near Nernstian response to nicotinium cation in the concentration range of 8.0×10 -6 ～1.0×10 -2 mol·L -1 ,with a slope of 58 mV·dec -1 .The electrode is simple and stable and has been applied to determine the nicotine content in the tobacco and cigarette smoke.Good agreement with UV spectroscopic method is observed.