南昌市大气细粒子PM_(2.5)中多环芳烃的污染特征及源解析

在南昌市布设5个采样点,代表交通干线区、工业区、商业区、居民区以及郊区,于2007年进行气溶胶PM_(2.5)的采样.各采样点测得的数据表明,PM_(2.5)中多环芳烃浓度呈现出夏低冬高的特征,空间分布上,南昌市PM_(2.5)中多环芳烃污染情况为交通干线>工业区>商业区>居民区>郊区,基于这些检测数据,通过因子分析法中的主成分分析法判断PM_(2.5)中多环芳烃的主要来源,利用多元逐步回归法确定各主要污染源对多环芳烃的贡献率.结果表明南昌市的主要污染源车辆排放源(标识物苯并(g,h,i)苝)、燃煤污染源(标识物荧蒽)、焦化污染源(标识物苯并(k)荧蒽)和高温加热源(标识物菲)对南昌市大气PM_(2.5)中多环芳烃的贡献率分别为31.0%、21.1%、25.8%和(14.6%).

Characteristic of PAHs Pollution and their Sources Apportionment in Fine Particulate Matter(PM_(2.5)) of NanChang City

Five sampling areas which represent traffic center,industrial area,commercial area,residential area and the suburb,were set in Nanchang city to collect fine particulate matter in ambient air of 2007.The determined data at various sampling areas illustrated that the polycyclic aromatic hydrocarbons (PAHs) concentration of PM_(2.5) in summer were lower than that in winter.In different areas the pollution severity order of PM_(2.5) was traffic center(worse than),industrial area,commercial area,residential area and suburb.Based on the data,the main sources of PAHs on fine particulate matter (PM_(2.5)) in Nanchang city were estimated by principal component analysis method of factor analysis method.The percentage of contributions of various pollution source to PAHs on fine particulate matter in Nanchang city were calculated by multiple linear stepwise analysis method.The main pollution sources were vehicle emission (identification was benzo(ghi)perylene),coal burning(identification was fluoranthene),high-temperature combustion(identification was benzo(k)fluoranthene) and coking pollution(identification was phenanthren) to PAHs in PM_(2.5) which accounted for 31.0%、21.1%、25.8% and 14.6%.