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在 ０．３ ｍｍ直径的铅笔芯上电修饰聚苯胺，封入玻璃毛细管中，并与Ａｇ／ＡｇＣｌ电极组合成复合微型ｐＨ电极。经实验测试，该电极的ｐＨ响应特性良好，在ｐＨ１～１１的线性范围内，能斯特斜率为（－５６．４±０．５）ｍＶ／ｐＨ，线性相关系数不小于０．９９６。作为参比的Ａｇ／ＡｇＣｌ电极性能稳定。由于电极是复合微型化的，所以可用于活体微区测定。
Polyaniline was electroporated on a 0.3 mm diameter pencil lead, encapsulated in a glass capillary, and combined with a Ag / AgCl electrode to form a composite micro pH electrode. The experimental results show that the pH response of the electrode is good, with a Nernst slope of (-56.4 ± 0.5) mV / pH and a linear correlation coefficient of no less than 0.996 in the linear range of pH1-11. The Ag / AgCl electrode as a reference has stable performance. Because the electrode is a composite miniaturized, it can be used for in vivo micro-area measurement.