气相分子吸收光谱法测定水体中氨氮的应用及相关研究

The related research on the use of gas-phase molecular absorption spectrometry method to detect the ammonia nitrogen in water

气相分子吸收光谱法作为测定水体中氨氮的一种仪器检测方法，具有快速、准确等优点。经典蒸馏一中和滴定法和纳氏试剂分光光度法测定水中氨氮，测定结果容易受到pH值、有机还原性物质的干扰。本文使用气相分子吸收光谱法测定水中氨氮，分别考察了pH值、COD浓度及NaOH试剂等因素对实验结果的影响。结果表明，pH值大于1的样品可以直接分析，无需调节pH值；样品中COD浓度在0—200mg／L范围内，水体中有机还原性物质对分析无影响，测定结果良好；NaOH试剂保存期在3个月内，测定空白值低。同时使用本方法做氨氮工作曲线，相关性F0．9997，线性范围可以达到3mg／L，优于两种经典方法。

The gas-phase molecular absorption spectrometry method is a new way to detect the ammonia nitrogen with fast and accurate advantages. The classical methods of the distillation-neutralization titration and the nessler＇ s reagent spectro- photometry are easily disturbed by pH and organic reducing matters. The paper used the gas-phase molecular absorption spectrometry method discusses the impact of pH, COD, and NaOH to the experiment. The results show that there is no im- pact to the ammonia nitrogen while the pH is larger than 1 and the COD is lower than 200 mg/L also has no impact. The validity of the NaOH reagent is three months, and during the time we can get low blank absorhance. The linear range of the gas-phase molecular absorption spectrometry method for ammonia nitrogen can reach 3 mg/L. and the relativity coefficient is 0.9997 which is better than the two classical methods.