柴油机排放多环芳香烃气/颗粒相分配研究  

Study on gas/particle phase distribution of polycyclic aromatic hydrocarbons in diesel engine emissions

作　　者：张华伟[1] 宋崇林[1] 吕刚[1] 何浩然[1] 卫将军[1] 宋金瓯[1] 

机构地区：[1]天津大学内燃机燃烧学国家重点实验室,天津300072

出　　处：《环境工程学报》2011年第10期2315-2320,共6页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金面上项目(51076116);天津市应用基础及前沿技术研究计划(09JCZDJC25100)

摘　　要：为了对柴油机排放PAHs在气相和颗粒相中的分配进行研究,采用了滤膜串联"PUF/XAD-2/PUF"吸附柱的方法采集柴油机排气中的气相和颗粒相PAHs,使用程序升温挥发(PTV)技术结合气相色谱-质谱联用(GC-MS)方法对PAHs进行了定性和定量分析。所用分析方法重复性的相对标准偏差(RSD)低于6.1%,检出限范围为0.016～0.375 ng/mL;滤膜的回收率为86.41%～118.35%,吸附柱回收率为71.83%～118.6%。结果表明:柴油机排放PAHs挥发性最强的二环主要存在于气相中,五环和六环PAHs主要存在于颗粒上,而三环和四环PAHs则在两相中平均分布。综合考虑吸附和吸收两种机理能更好地解释柴油机排放PAHs在两相中的分配行为。In order to investigate the distribution in the gas and particle PAHs from diesel engine,particle and gas-phase polycyclic aromatic hydrocarbons（PAHs） in the exhaust were collected by filters tandem ＂PUF/XAD-2/PUF＂ cartridge.The samples were analyzed by PTV-GC-MS qualitatively and quantitatively.The relative standard deviation（RSD） of the detection method was less than 6.1% with detection limits between 0.016～0.375 ng/mL,and the recoveries were 86.41%～118.35% for filters and 71.83%～118.6% for ＂PUF/XAD-2/PUF＂ cartridge,respectively.The results show that the most volatile polycyclic aromatic hydrocarbon,that is the two-ring PAHs,mainly exists in the gas phase.Five-and six-ring PAHs are adsorbed on particles,while the three-and four-ring PAHs exist in the two-phase equilibrium distribution.Considering two main mechanisms,namely adsorption and absorption,the gas/particle phase distribution behavior of PAHs in diesel emissions can be explained better.

关 键 词：柴油机 多环芳香烃 气/颗粒相 气相色谱-质谱联用 

分 类 号：TK464[动力工程及工程热物理—动力机械及工程]