生活污水中氨氮比例较高(NH+4-N/TN≥90%)时,实验室测得的总氮值经常低于氨氮值。针对这一情况,使用智能消解仪作为消解装置,在消解时间为50 min、消解温度为122℃、碱性过硫酸钾用量(浓度同国标方法)为1.5 mL的条件下,测定结果良好,消除了氨氮测定值高于总氮测定值的现象,同时减少了实验耗时和碱性过硫酸钾用量。 When the proportion of ammonia nitrogen in domestic sewage is high (NH + 4-N / TN≥90%), the total nitrogen value measured in the laboratory is often lower than the value of ammonia nitrogen. In response to this situation, the use of smart digestion device as a digestion device, the digestion time is 50 min, digestion temperature is 122 ℃, the amount of basic potassium persulfate (concentration with the national standard method) under the conditions of 1.5 mL, the determination of good results, eliminate Ammonia measured value higher than the measured value of total nitrogen phenomenon, while reducing the experimental time-consuming and basic potassium persulfate dosage.