机动车尾气造成的苯系物污染状况调查

Study on Benzene, Toluene, Xylene Pollution Resulted From Vehicle Emission by Tenax TA Adsorption,Thermal Desorption,Capillary Gas Chromatography

目的调查机动车尾气造成的苯、甲苯、二甲苯的污染状况。方法采用TenaxTA吸附-二次热解吸-毛细管气相色谱法监测了交通路口大气中苯系物的浓度和个体接触量。结果交通路口大气中苯、甲苯、二甲苯浓度范围分别为0.041～0.276、0.002～0.132、0.008～0.091mg/m3。结论大气中苯系物浓度与车流量及路况有关,车流量较大尤其是道路堵塞时,苯系物浓度较高。骑车人的个体接触量略大于交通路口大气中苯系物的含量。风和降雨有利于污染物的扩散,空气中苯系物浓度较低。

Objective To investigate benzene, toluene, xylene(BTX) pollution resulted from vehicle emission. Methods Concentration of BTX in ambient air at traffic intersection and personal exposure were monitored by Tenax TA adsorption,thermal desorption,capillary gas chromatography. Results The concentration range of benzene, toluene, xylene at traffic intersection is 0.041-0.276 mg/m3, 0.002-0.132 mg/m3, 0.008-0.091 mg/m3 respectively. Conclusion The concentration of BTX is higher when traffic jammed. The personal exposure to BTX for bicycle rider is higher than the concentration of the traffic intersection. Wind or rain could reduce the concentration of air pollutants.