北京东南郊大气TSP中多环芳烃的源解析

Source apportionment of atmospheric polycyclic aromatic hydrocarbons in TSP in the southeastern suburb of Beijing, China

通过分析2005年3月至2006年1月间北京市东南郊3个采样点大气总悬浮颗粒物(TSP)样品中多环芳烃(PAHs)的浓度,对北京市东南郊大气TSP中的多环芳烃的来源进行了解析.4个季节中16种多环芳烃组分比例变化反映出各个季节PAHs来源的变化;各方向风频数与PAHs浓度的相关分析表明,研究区内PAHs浓度与西北方向的污染来源贡献密切相关;利用比值法进行源解析,发现研究区PAHs的主要来源为燃煤,此外机动车和焦炉源也可以识别出来;应用因子分析和多元线性回归计算出3个采样点各PAHs源的相对贡献率.

Concentrations of 16 PAHs in TSP samples collected from March, 2005 to January, 2006 were analyzed at 3 sampling sites in the southeastern suburb of Beijing. Changes of PAHs concentrations with seasons reflected the seasonal variation of PAHs sources. Correlation analysis between wind direction frequencies and PAHs concentrations indicated the existence of a significant migration of PAHs from the northwest of the study area. Ratio analysis illustrated that coal - burning was the main source of PAHs in the study area. In addition, other sources including vehicles and coke were also identified. Contribution of different PAHs sources was calculated by applying factor analysis and multiple linear regression method.