气相分子吸收光谱法测定水质氨氮试剂条件的优化研究

Optimization of reagent conditions for ammonia-nitrogen analysis in water by gas-phase molecular absorption spectrometry

气相分子吸收光谱法测定成分复杂实际样品氨氮含量时,现有的标准方法中试剂条件氧化能力弱、氧化时间长、抗干扰能力差,很难满足实际分析需求,制约了仪器的应用。本研究在理论计算、查阅文献的基础上,开展单因素实验和正交实验,较系统地研究并优化气相分子吸收光谱法测定水质氨氮试剂条件。在该试剂条件下,地表水、地下水、海水、生活污水、工业废水等5种类型样品的分析结果表明,气相分子吸收光谱法和纳氏试剂分光光度法测定氨氮有较好的可比性,验证了本实验得出试剂条件的适用性、有效性。

Due to the disadvantages such as weak reagent conditions oxidation capacity,long oxidation time and poor anti-interference ability in the existing standard method,it is difficult to meet the needs of actual analysis and restricts the application of the instrument.On the basis of theoretical calculation and literature consultation,univariate experiments and orthogonal experiments were carried out in this paper,and the optimal reagent conditions for ammonia nitrogen determination by gas phase molecular absorption spectrometry was studied and proposed.Under the optimized reagent conditions,the analysis results of five types of samples,i.e.surface water,groundwater,seawater,domestic sewage,and industrial wastewater,showed that the spectrophotometric determination of ammonia nitrogen by gas phase molecular absorption spectrometry was in accordance with Nashrie reagent spectrophotometric method and the applicability and effectiveness of the reagent conditions obtained in this paper were verified.