空气中挥发性有机物的光谱学在线监测技术

Techniques of On-Line Monitoring Volatile Organic Compounds in Ambient Air with Optical Spectroscopy

挥发性有机物(VOCs)是一类危害极为严重的大气污染物,其在线监测技术对于环境保护具有重要的意义。迄今为止,没有任何一种技术能够满足对所有VOCs进行监测的需求。分析了非色散红外方法、傅里叶变换红外光谱、光学差分吸收光谱、激光光谱等可以对VOCs进行在线监测的光谱学方法的特点和现状,并与VOCs的标准检测方法进行了比较,重点分析了调谐二极管激光吸收光谱(TDLAS)技术的发展现状及趋势。

Volatile organic compounds（VOCs）are harmful gaseous pollutants in the ambient air.The techniques of on-line monitoring VOCs are very significant for environment protection.Until now,there is no single technology that can meet all the needs of monitoring various VOCs.The characteristics and present situation of several optical methods,which can be applied to on-line monitoring VOCs,including non dispersive infrared（NDIR）,Fourier transform infrared（FTIR）spectroscopy,differential optical absorption spectroscopy（DOAS）,and laser spectroscopy were reviewed.Comparison was completed between the national standard methods and spectroscopic method for measuring VOCs.The main analysis was focused on the status and trends of tuning diode laser absorption spectroscopy（TDLAS）technology.