利用激光电离技术进行大气压力下的环境苯系物的探测,是一种新的探测方法,它能快速、实时、在线测量环境中苯系物的浓度,并且设备简单,不需要复杂的真空系统,其探测灵敏度小于5 ppb,时间分辨率为4 s.该方法尤其适合机动车道边附近的测量.文中介绍了系统结构和主要参数,报道了该仪器在不同的交通状况下,探测大气环境中苯系物的一些结果,车流量大则污染严重,车流量小则污染轻.

It is a new method for detection of environmental BTEX in the atmospheric pressure using the technique of laser ionization . The features of the method is high speed, real-time and on-line detection of the concentrations of environmental BTEX . The instrument is simple and does not need complicated vacuum system. Its detection sensitivity is below 5 ppb, time-resolution is 4 s. This method is especially suitable to measurement of exhaust gas of vehicle by roadside. The present paper gives an introduction to the systematic structure, major parameter and some results obtained from a monitoring of atmospheric environmental BTEX in the case of different traffic. The pollution would be more heavy when the traffic is busy, on the contrary, it would be light.