呼和浩特市冬季PM_(10)中多环芳烃的污染特征及来源解析

Characterization and source apportionment of Polycyclic aromatic hydrocarbons bound to PM_(10) during winter in Hohhot

2013年12月在呼和浩特市主城区9个环境空气监测点位同步采集PM_(10)样品,对PM_(10)浓度和16种多环芳烃的浓度、污染特征进行了分析,使用特征比值和主成分分析对多环芳烃来源进行了解析.9个监测点位的PM_(10)浓度介于23.5—322μg·m-3之间,16种多环芳烃总量介于5.34—850 ng·m-3之间.荧蒽、芘、苯并[a]蒽、、苯并[b]荧蒽、苯并[a]芘、苯并[g,h,i]苝和茚并[1,2,3-cd]芘等多环芳烃单体浓度较高,这8种多环芳烃占多环芳烃总浓度的80.4%.主成分分析所获得污染源结果和特征比值法定性判断出的污染源结果一致,燃烧源、机动车尾气源和石油源为主要污染源,分别贡献61.3%、16.0%和10.4%.

PM10 samples were simultaneously collected from nine urban sites in Hohhot, during 7th- 17th December 2013. The concentrations of PMlo and 16 polycyclic aromatic hydrocarbons were determined. The source apportionment of PAHs in PM10 was estimated by the diagnos （PAHs） tic ratios of PAHs and principal component analysis （PCA）. Total PAHs concentrations in PM10 were in the range of 5.34-850 ng. m-3, while the concentrations of PM10 ranged in 23.5-322 μg. m-3. Flu, Pyr, BaA, Chr, BbF, BaP, BP and InP were abundant in the nine urban sites, accounting for 80.4% of the PAHs total concentrations. The diagnostic ratios and principal component analysis indicate that biomass ＆ coal combustion, vehicle emission and petroleum were the main sources with contribution rates of 61.3%, 16.0% and10.4%.