差分光谱法连续监测空气中SO_2、NO_2、苯、甲苯方法探讨

Study on differential Optical Absorption Spectrometer for SO_2,NO_2,benzene and toluene

差分光谱法 (简称DOAS)已广泛用于空气中SO2 、NO2 、苯、甲苯监测。通过对差分光谱法监测结果与其他传统仪器进行对比 ,发现用DOAS监测SO2 、NO2 与点式仪器有较好的一致性 ,但用DOAS系统监测苯、甲苯与气相色谱法有机物连续监测结果差异较大 ,相关性较差 ,运行有一定的局限性。另外 ,本文对DOAS的最佳运行条件进行了探讨 ,发现影响光强的氙灯老化和气候条件对DOAS系统运行有较大影响。

A field based intercomparison study was done to evaluate the performance of DOAS system.In the study,SO_2 and NO_2 was measured by DOAS and conventional TE monitor,benzene and toluene was measured by DOAS and GC method. The evaluation illustrated that the two methods for SO_2 and NO_2 have good correlation,but the two methods of GC and DOAS for benzene and toluene was unsatisfactory especially for toluene .In addition,in this study,The best running condition for DOAS was discussed.