Characterization and source identification of PM10-bound polycyclic aromatic hydrocarbons in urban air of Daqing, China

摘要

The concentrations of 17 selected PAHs in PM10 were quantified at three sites in city center of Daqing from April 2008 to January 2009.Total concentration of 17 selected PAHs was 67.09 ng/m3 in average,and the dominant PAHs were PA,FLu,Ant,FL,BaA,CHR and Pyr accounting for above 80％ of 17 selected PAHs.Spatial variations were predominantly due to the different strengths of source emission.Higher PAHs concentrations during heating period and lower concentrations during no-heating period were observed at the three sampling sites,which may be caused by the stronger emissions from stationary combustion sources in heating period and the quicker air dispersion,washout effects,photodegradation and higher percentage in the air in vapor phase in no-heating period.The contributions from potential sources to PAHs in PMl0 were estimated by the Principal Component Analysis (PCA).In whole sampling period,oil refinery and coal combustion were found to the predominant contributor of PM10bound PAHs,followed by vehicles emission and wood combustion.