采用三级冷阱预浓缩和气相色谱质谱联用仪分析了天津市华苑居住区大气中挥发性有机物(VOCs)组成,总共检测108种物质,其中烷烃和苯系物占VOCs总量59.2%。冬春两季总挥发性有机物(TVOCs)浓度范围分别为519.4—1029.6μg/m³和299.8—463.8μg/m³,其中丙酮平均浓度最高(20.0μg/m³),正庚烷最低(1.1μg/m³)。TVOCs和单质浓度呈现出冬高春低特点,这与大气层对污染物降解和稀释能力的季节性变化存在一定关系,而另一个重要原因则是周边源产生的污染物在大气输送下对华苑地区的影响。

The chemical speciation of Volatile Organic Compounds (VOCs) in the air of the Huayuan region, Tianjin is analyzed by using the GC-MS with pre-concentration of three-level cold trap. A total of 108 VOCs species are detected. The major components are alkanes and aromatics which account for 59.2% of VOCs. The average mass concentration range of VOCs in the winter and spring is 519.4—1029.6μg/m³, 299.8—463.8μg/m³, respectively. Among them, the acetone has the maximum concentration (20.0μg/m³); meanwhile the heptane has the minimum concentration (1.1μg/m³). The average mass concentration of VOCs and individual substances are higher in the winter than that in the spring. It could be explained by the seasonal variation of atmospheric degradation and dilution, while another important reason is that the surrounding pollutant sources due to atmospheric transport have an effect on Huayuan region.