|选用纳氏试剂分光光度法测定氨氮时，比较蒸馏法中分别以硼酸和纯水为吸收液时氨氮的检测效果。结果显示，当氨氮质量浓度＞1.0 mg/L时，用纯水或硼酸作吸收液均可；当氨氮质量浓度＜1.0 mg/L时，应以纯水为吸收液。
|关键词: 氨氮 纳氏试剂分光光度法 蒸馏法 吸收液
|Improvement on Pretreatment for the Determination of Low concentration Ammonium Nitrogen in Water Using Nessler Reagent Method
LI Hongliang， ZHAO Hui， XU Xiaocui， ZHU Zejun
Henan Province Environmental Monitoring Center， Zhengzhou， Henan 450004， China
|Comparison was made between using boric acid and pure water as the absorption solution during distillation using the Nessler reagent spectrophotometric method for determining the concentration of ammonium nitrogen in water. The results showed that when the concentration of ammonium nitrogen was higher than 1.0 mg/L， either boric acid or pure water could be used as the absorption solution. When the concentration was less than 1.0 mg/L， pure water was a better choice.
|Key words: Ammonium nitrogen Nessler reagent spectrophotometry Distillation Absorption solution