基于掺杂聚吡咯的硝酸根离子选择性电极

摘要

研究了一种基于硝酸根掺杂聚吡咯技术的硝酸根离子选择性电极.该电极以玻碳电极为载体,以包含硝酸根离子的聚吡咯薄膜为电极敏感膜.在含有硝酸根离子浓度数量级为10-4.5,10-40,10-3.5,10-3.0,10-2.5,10-2.0mol/L的硝酸钠测试溶液中,电极的响应电势呈现出较为理想的线性关系,且电势斜率值接近于理论值,符合能斯特响应规律;电极操作简便,具有较短的响应时间和较好的重复性.该电极的研发成功,为当前环境水质监测中总氮的实时监测提供了一种有效的解决方案.%A nitrate ion selective electrode, using glassy carbon electrode as a carrier and polypyrrole film containing nitrate ion as a sensitive film is studied based on nitrate doped polypyrrole technology. The response of the electrode potential shows good linear relationship in the sodium nitrate solution containing nitrate concentration on the order of 10 -4.5,10 -4.0,10 -3.5,10 -3.0 ， 10 -2.5,10 -2.0 mol/L. The potential slope value is closed to the theoretical value and meets Nernst Law. The electrode is simple to use, with short response time and good repeatability. It has provided an effective proposal to the real-time monitoring of total nitrogen.