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本文以7402为活性物质,采用PVC膜和氮化硅绝缘栅场效应管制成硝酸根离子敏感场效应管(NO_3~--ISFET)。其响应符合能斯特方程,检测下限为3×10~(-5)M,响应时间为6秒,时漂为0.2毫伏/小时,寿命超过一个月。并利用它测定了废水样品中的硝酸根,获得满意的结果。
In this paper, 7402 as active material, the use of PVC film and silicon nitride insulated gate field effect transistor made nitrate ion-sensitive FET (NO_3 ~ - ISFET). The response meets the Nernst equation with a detection limit of 3 × 10 -5 M, a response time of 6 seconds, a drift time of 0.2 mV / h and a lifetime of more than one month. And use it to determine the nitrate in wastewater samples, to obtain satisfactory results.