【摘要】 沿太原市冬季主导风向布点,用苏玛罐采样,预浓缩-GC/MS联用技术,调查分析了太原市冬季大气VOCs浓度水平、种类特点及分布特征等。结果表明:太原市冬季大气VOCs平均浓度为207.8ug/m3,污染水平为中等,以苯为首的芳香烃类物质浓度相对较高;城郊结合带为研究区VOCs污染最严重的区域,下风向区域VOC浓度高于上风向;日间VOCs浓度高于夜间且为双峰特征,受晚交通高峰影响明显;晴朗日VOCs浓度上午高于下午,多云或阴天下午VOCs浓度略高。燃煤是太原市冬季大气VOCs的主要贡献源,其次为机动车尾气排放。更多还原

【Abstract】 We researched the concentration levels,density and distribution characterristics of volatile organic compounds in winter of Taiyuan by air pre-concentration-GC/MS technology. Sampling points were established according to the winter predominant winds. The results were as follows: average VOCs concentration was207. 8 ug·m-3 in winter of Taiyuan,it was a moderate level in the national city. The concentrations of aromatic hydrocarbon,especially benzene,were in higher levels and affected by the local source emissions and werther conditions. VOCs concentrations in downwind points were higher than upwind points,and the maximum was arised at urbanrural juncture belt area. VOCs concentrations during the day were higher than night and showed double characteristics. Primary sources of VOCs in winter of Taiyuan were winter heating and coal combuation of industrial,another was vehicular exhaust.更多还原