大气中多环芳烃气固相分配与颗粒物粒径的关系

The correlation of size distribution and gas/particle partitioning of atmospheric polycyclic aromatic hydrocarbons (PAHs)

聚集了2005年5月16日-6月3日上海市桃浦地区气相样品、TSP样品及不同粒径的颗粒物样品．用GC—MS对各样品中美国EPA规定优先控制的16种多环芳烃（PAHs）做了定量分析．结果表明，大气中PAHs的气固相分配系数（Kp）和各物质的过冷饱和蒸气压（P1^0）呈良好的线性相关．多元线性回归分析表明，PAHs的气固相分配受颗粒物粒径大小的影响，粒径越大，对PAHs的气固相分配影响越大；过冷饱和蒸气压越高，气固相分配越易受到粒径大小的影响．

Gas-and particle-phase （TSP and its size distributions） air samples collected in TaoPu area in Shanghai from 16 May to 3 June, 2005 have been analyzed for 16 priority-controlled polycyclic aromatic hydrocarbons （PAHs） by gas chromatography with mass selective detection （GC-MS）. The gas/particle partition coefficients （Kp） of PAHs were well correlated with their sub-cooled liquid vapor pressure （p1^0）. However, multiple linear regression analysis showed that particle sizes also had effects on the Kp of PAHs, and the effects increased with larger particle size and higher p1^0.