黄石市夏季大气颗粒物中多环芳烃污染特征解析

Pollution Characteristics and Source Apportionment of PAHs in Atmospheric Particles during the Summer in Huangshi City

通过采集典型矿区城市——黄石市新老城区大气颗粒物PM10和PM2.5的样品,并采用热解吸-气质联用法对黄石市夏季大气颗粒物中多环芳烃（PAHs）的污染特征和来源进行了研究.结果表明：黄石市老城区大气颗粒物中PAHs的浓度均明显高于新城区;在新、老城区大气PM10和PM2.5中PAHs的浓度变化范围分别为6.037～10.691 ng/m3、12.132～18.440 ng/m3和5.685～10.145 ng/m3、9.314～15.998 ng/m3;新、老城区大气颗粒物中低分子量PAHs含量较低,3环化合物呈相对优势分布,表明以石油源输入为主的来源特征,对比4环及其以上高分子量PAHs含量发现,老城区有明显的化石燃料不完全燃烧来源特征.

For the purpose of analyzing the pollution characteristics and source apportionment of polycyclic aromatic hydrocarbons （PAHs） in atmospheric particles during the summer in a typical mining city, Huangshi City, this paper collects atmospheric particle samples from the old and new towns by miniVol （5 L/min, 12 h, Airmetrics USA） during summer days in Huangshi City and analyzes PAHs in the samples by thermal desorption-temperament union usage. The results show that PAHs in atmospheric particles in the old town are significantly higher than those in the new town. PAHs concentrations in PM2s and PM10 in the new and old towns are in the range of 6. 037~ 10. 691 ng/m3 and 12. 132-18.440 ng/m3 ,and 5. 685~10. 145 ng/m3 and 9. 314--15. 998 ng/m3 ,respectively. In atmospheric particles, the PAHs content of low molecular weight is low and the compound of 3 rings is in the rela- tively advantageous distribution, which indicates that the main source characteristics come from the source of oil and, in contrast, the PAHs content of 4 or more rings in the old town has obviously the source characteristics of the incomplete combustion of fossil fuel.