| 西安城区秋季大气中多溴联苯醚的污染特征及来源分析 |
| 摘要点击 4147 全文点击 2444 投稿时间：2010-09-26 修订日期：2011-01-27 |
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| 中文关键词 多溴联苯醚 西安 气粒分配 相关性 因子分析 |
| 英文关键词 polybrominated diphenyl ethers (PBDEs) Xi'an gas-particle partitioning correlations factor analysis |
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| 中文摘要 |
| 为了评估西安大气中多溴联苯醚（PBDEs）的污染程度，2008年8～10月，利用大流量主动采样器采集了西安城区气态和颗粒态大气样品.分别利用GC-MS和GC/ECD对低溴PBDEs 和BDE-209进行分析，12种PBDEs的总浓度（气相+颗粒相）范围为37.43～620.30 pg/m3，平均值为216.28pg/m3，其中三溴至七溴联苯醚（∑11PBDEs）和BDE-209的浓度范围分别为16.32～86.49 pg/m3和16.34～576.01 pg/m3.三溴和四溴联苯醚主要存在于气相中，五溴至七溴联苯醚在颗粒相中含量高于气相含量，而十溴联苯醚BDE-209则只在颗粒相中检出，随着溴原子个数的增加，PBDE单体在颗粒相的含量比重呈现增大趋势.西安城区秋季大气中PBDEs的气固相分配系数和过冷饱和蒸气压有显著相关性，PBDEs的气粒分配接近于平衡.对PBDEs单体作相关性分析，结果发现除过BDE-85，其它PBDEs单体之间均具有较好的相关性，因子分析表明西安大气中PBDEs主要来源于Penta-BDE和Deca-BDE污染. |
| 英文摘要 |
| Air samples in gas and particle phases were collected using a high volume active sampler from August to October in 2008 at Xi'an for evaluating the pollution level of polybrominated diphenyl ethers (PBDEs). Lower brominated PBDEs and BDE-209 were analyzed via GC-MS and GC/ECD, respectively. The total concentrations (gas plus particle phases) of 12 PBDEs were ranged from 37.43 to 620.30 pg/m3, with an average of 216.28 pg/m3, while tri- to hexa-brominated congeners (∑11PBDEs) ranged from 16.32 to 86.49 pg/m3, BDE-209 ranged from 16.34 to 576.01 pg/m3. Tri- to tetra-brominated congeners existed mainly in gas phase, tetra- to hexa-brominated congeners were predominated in particle phase, and BDE-209 was detected only in particle phase. The proportion of PBDEs in particle phase increased with bromine number. Gas-particle partition coefficient of PBDEs was well correlated with sub-cooled liquid vapor pressure, and the partitioning of PBDEs between gas and particle phases were close to equilibrium. Correlation analysis indicated that all the PBDEs have good coefficients except BDE-85. Source analysis indicated that PBDEs in the atmosphere of Xi'an were mainly from the Penta-BDE and Deca-BDE contamination. |
