| 西安采暖季大气中多环芳烃的污染特征及来源解析 |
| 摘要点击 3231 全文点击 1527 投稿时间：2009-09-19 修订日期：2009-12-08 |
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| 中文关键词 多环芳烃 气粒分配 来源解析 因子分析 偏相关分析 西安 |
| 英文关键词 polycyclic aromatic hydrocarbons (PAHs) gas-particle partitioning source apportionment factor analysis partial correlation analysis Xi’an |
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| 中文摘要 |
| 采用改进型的大流量主动采样器，对西安采暖季大气总悬浮颗粒物(TSP)样品和气相样品进行了连续采集，利用GC-MS测定多环芳烃(PAHs)的浓度.结果表明，颗粒态和气态样品中∑16PAHs平均值分别为(108.15 ± 41.44) ng/m3和(260.14 ± 99.84) ng/m3，2～3环的PAHs主要分布在气态中，而>4环的PAHs主要分布在颗粒态中，PAHs的气固相分配系数和其过冷饱和蒸气压具有良好的相关性.温度与分配系数也具有显著相关性，并应用逐步回归方法得出分配系数与温度的回归方程.利用特征分子比值法进行源解析，发现西安大气中PAHs主要来源于煤的不完全燃烧和汽车尾气的排放，并利用因子分析和多元线性回归对各种来源的贡献率进行了计算.通过污染指数与因子的代表物质进行偏相关分析, 发现某些PAHs与SO2、NO2来自于相同的污染源. |
| 英文摘要 |
| TSP samples and gas phase air samples were collected by an improved high volume active air sampler during domestic heating season in Xi’an, and the concentrations of polycyclic aromatic hydrocarbons (PAHs) were analyzed via GC-MS. The results showed that average concentrations of ∑16PAHs in TSP and gas phase were (108.15 ± 41.44) ng/m3, (260.14 ± 99.84) ng/m3, respectively. Two and three ring PAHs dominated in the gas phase, while more than four ring PAHs were mainly adsorbed on the particle phase. Good correlation was found between gas-particle partition coefficient and the respective sub-cooled vapor pressures of PAHs. A significant correlation was also found between partition coefficient and temperature, and the regression equation was put forward by stepwise linear regression method. Ratio analysis illustrated that coal burning and vehicle exhaust were the main source of PAHs in Xi’an. Contribution of each source was calculated by factor analysis and multiple linear regression. Partial correlation analysis was applied to study the relationship between air pollution indexes and some representative PAHs of individual factors, which indicated some PAH had same source to SO2 and NO2. |
