The monitoring of ambient air in two typical traffic arteries (Daqing Road and Chang’an Road) in Xi’an was carried out by activated carbon adsorption/carbon disulfide desorption coupled with gas chromatography.The concentration levels and diurnal variations of benezenes (benzene,toluene,ethylbenzene and xylenes (BTEX)) were studied during winter and summer.Results showed that the average mass concentrations of total BTEX during winter were 55.27 and 46.01 μg/m3 in Daqing Road and Chang’an Road,respectively,and those during summer were 32.54 and 20.32 μg/m3,respectively.The most dominant BTEX were benzene and toluene in both sampling points.The diurnal variations of BTEX showed that 3 peaks existed in winter while only 2 peaks in summer;the evening peak came later in Chang’an Road because Chang’an Road located in commercial area.%利用活性炭吸附/二硫化碳解吸一气相色谱法对西安市具有代表性的大庆路和长安路两处交通主干遵进行环境空气监测,分析了冬季和夏季的苯、甲苯、乙苯、二甲苯(BTEX)等苯系物的浓度水平和日变化特征.结果表明,大庆路和长安路环境空气中总BTEX平均质量浓度冬季分别为55.27、46.01 μg/m3,夏季分别为32.54、20.32 μg/m3.两路段最主要的BTEX均为苯和甲苯.BTEX日变化趋势研究显示,冬季呈现早中晚3个高峰,而夏季只有早晚两个高峰;长安路由于地处西安市繁华的商业区,晚高峰出现的比大庆路晚.
展开▼
