华中地区背景站大气颗粒物中多环芳烃的初步研究

In this paper, Air samples were collected consecutively at Jinsha by a modified Anderson-type Hi-Volume air sampler at six-day intervals from March 2012 to March 2013, to determine the seasonal variations and potential sources of polycyclic aromatic hydrocarbons (PAHs) in the atmosphere of a background site (Jinsha) in central China. The mass concentration of particle PAHs were 7.50 ng/m3 in the atmosphere of Jinsha site. The particle PAHs concentrations showed clear seasonal variations in the following order: winter （16.36±7.68 ng/m3）> autumn（6.42±3.89 ng/m3） > spring （3.88±2.57 ng/m3）> summer（2.64±2.60 ng/m3）. High ring PAHs (> 4 rings) predominated in the particle phase, accounting for 93.5% of the total PAH mass. The particle PAHs concentration exhibited a significantly negative relationship with temperature. Five-day back trajectory analysis indicated that high air concentrations of PAHs were observed when air mass were from northeast and northwest, while the lowest concentrations of PAHs were related to the air mass from South and East.