西安城区秋季大气中多溴联苯醚的污染特征及来源分析

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216.28 pg/m...

Pollution Characterization and Source Apportionment of Polybrominated Diphenyl Ethers in Autumn Air of Xi'an

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 (Sigma11 PBDEs) 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.