石河子市大气中多溴联苯醚的含量组成及气粒分配

Levels,Compositions and Gas-Particle Partitioning of Polybrominated Diphenyl Ether in Air of Shihezi,a Chinese Northwastern City

在石河子市自2008年9月至2009年8月间每周采集大气样品,利用GC-MS分析其中的12种PBDEs,结果显示:石河子市大气中PBDEs的年平均浓度为118±83 pg/m3,低于我国其他较发达城市大气中PBDEs的含量.BDE-209是含量最高的单体,年平均含量占总量的65%,其次是BDE-47和BDE-99,年平均含量分别占总量的9%和7%.气-粒分配的研究结果显示,石河子市大气中PBDEs在气态和颗粒态间的分配并未达到平衡,温度是影响PBDEs在气相与颗粒相间分配的重要因素.比较而言,夏季最为接近平衡状态.

Air samples were collected every week from September 2008 to August 2009 in Shihezi, twelve kinds of PBDEs in the air were detected and analyzed by GC-MS. Annual arithmetic mean concentra-tions of ∑12 PBDEs （gas ＋ particle phase） in air samples collected from Shihezi was 118 83 pg/m^3 ,lower than that in other relatively developed cities. BDE-209 was the dominating congener in all seasons with the average contribution of 65% of ∑12 PBDEs,followed by BDE-47 and BDE-99. The result of PBDEs gas-particle partitioning analysis indicated that PBDEs in gas and particle phases were closer to equilibrium at higher temperature periods, and temperature was an important factor of equilibrium between gas and particle phase.