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In order to control the pH of the samples, point to point ISE calibration measure, ion-selective electrode and pH-regulator are used. 应用离子选择性电极法测定锌氨络合液中的氨氮，省去了其他繁琐的步骤，具有操作简便、结果准确、精密度高、检测范围广等优点。