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探讨了纳氏试剂比色法测定水中氨氮的最佳操作条件，找到了水样预处理的最佳ｐＨ值，并通过实验得出：为提高测量精度，必须准确控制测试液酸度。
The optimum operating conditions for the determination of ammonia nitrogen in water by Nessler ’s reagent colorimetric method were discussed. The optimal pH value of pretreatment for water sample was found. The experimental results showed that the acidity of test liquid must be controlled accurately to improve the measurement accuracy.