NO2是大气污染的主要气体之一,其浓度的快速监测对相应地区环境改善具有重要的指导意义.本文以NO2浓度极低时的地面天顶光作为参考光谱,其它时刻天顶光作为样品光谱,利用差分吸收光谱(Differential Optical Absorption Spectroscopy,DOAS)法,对2014年2月5日邯郸市大气中NO2浓度及其变化进行了实时监测,并分析了浓度变化的原因.本文采用的NO2浓度监测方法具有实验搭建简单、耗费较低、精度较高等优点,具备较强的实用性.

NO2 is one of the major atmospheric pollution gases.Rapid monitoring for NO2 concentration has an important significance to improve the environment.In this paper,NO2 concentration and evolution in Handan city at February 5,2014 are monitored real time by the differential optical absorption spectroscopy (DOAS).In the monitoring,the zenith light spectrum with low NO2 concentration collected on the ground is employed as the reference spectra,and other zenith light spectrums are used as sample spectrum.The reason of NO2 concentration variation is analyzed in detail.The monitoring technique in this article is practical since it has the advantages of simple experimental platform,low cost and high precision.