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本文报道了用石墨内导及中性载体PVC膜平头pH电极作内电极的氨气敏电极,比较了二壬胺、三壬胺、三辛胺、Amberlite LA-1及LA-2等中性载体用作pH敏感PVC膜内电极电活性材料的性能,pH敏感电极端部与聚四氟乙烯或其它多孔气透膜接触,形成0.01M NH_4Cl-0.1M NaCl中介液(AgCl饱和)的薄层。以LA-2为电活性材料时氨电极的线性范围为1.0×10~(-1)-1.0×10~(-5)M,检测下限8.0×10~(-6)M,斜率55.3mV/pc。讨论了氨电极的响应时间,重现性和使用寿命及有关实验参量对电极性能的影响。电极已试用于屠宰场废水中氛氮和硝酸盐氮总量的测定。
In this paper, we reported the ammonia gas sensing electrode with graphite inner guide and neutral carrier PVC membrane flat head pH electrode as inner electrode, and compared neutrals such as dinanine, trinonlamine, trioctylamine, Amberlite LA-1 and LA-2 The carrier was used as a cathode active material for pH-sensitive PVC films. The tip of the pH-sensitive electrode was contacted with PTFE or other porous gas permeable membrane to form a thin layer of 0.01 M NH 4 Cl-0.1 M NaCl (AgCl saturated) . The linear range of ammonia electrode was 1.0 × 10 -1 -1.0 × 10 -5 M with LA-2 as the electroactive material, the detection limit was 8.0 × 10 -6 M, the slope was 55.3 mV / pc The effect of ammonia electrode response time, reproducibility and service life on the performance of the electrode was discussed. Electrodes have been tested for determination of total nitrogen and nitrate nitrogen in abattoir wastewater.