Determination of organic compounds from wood combustion aerosol nanoparticles by different gas chromatographic systems and by aerosol mass spectrometry

详细信息    查看全文

• 作者：Totti Laitinen ; Sara Herrero Martí ; n ; Jevgeni Parshintsev ; Tuulia Hyö ; tylä ; inen ; Kari Hartonen ; Marja-Liisa Riekkola ; Markku Kulmala ; José ; Luis Pé ; rez Pavó ; n
• 关键词：Aerosols ; Nanoparticles ; Wood pyrolysis ; GC × ; GC– ; MS ; GC– ; MS ; Aerosol MS
• 刊名：Journal of Chromatography A
• 出版年：2010
• 出版时间：1 January 2010
• 年：2010
• 卷：1217
• 期：1
• 页码：151-159
• 全文大小：1140 K

文摘

Organic compounds in atmospheric nanoparticles have an effect on human health and the climate. The determination of these particles is challenged by the difficulty of sampling, the complexity of sample composition, and the trace-level concentrations of the compounds. Meeting the challenge requires the development of sophisticated sampling systems for size-resolved particles and the optimization of sensitive, accurate and simple analytical techniques and methods. A new sampling system is proposed where particles are charged with a bipolar charger and size-segregated with a differential mobility analyzer. This system was successfully used to sample particles from wood pyrolysis with particle sizes 30–100 nm. Particles were analyzed by four techniques: comprehensive two-dimensional gas chromatography–time-of-flight mass spectrometry, gas chromatography–time-of-flight mass spectrometry, gas chromatography–quadrupole mass spectrometry, and aerosol mass spectrometry (aerosol MS). In the chromatographic techniques, particles were collected on a filter and analyzed off-line after sample preparation, whereas in the aerosol MS, particle analysis was performed directly from the particle source. Target compounds of the samples were polyaromatic hydrocarbons and n-alkanes. The analytical techniques were compared and their advantages and disadvantages were evaluated. The sampling system operated well and target compounds were identified in low concentrations.