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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. 應用離子選擇性電極法測定鋅氨絡郃液中的氨氮，省去了其他繁瑣的步驟，具有操作簡便、結果準確、精密度高、檢測範圍廣等優點。