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. Organic aerosol (OA) constitutes a large fraction of fineparticulate matter (PM) in the urban air. However, the chemical nature andsources of OA are not well constrained. Quantitative analysis of OA isessential for understanding the sources and atmospheric evolution of finePM, which requires accurate quantification of some organic compounds (e.g.,markers). In this study, two analytical approaches, i.e., thermal desorption(TD) gas chromatography mass spectrometry (GC-MS) and solvent extract (SE)GC-MS, were evaluated for the determination of n-alkanes, polycyclic aromatichydrocarbons (PAHs) and hopanes in ambient aerosol. For the SE approach,the recovery obtained is 89.3 %–101.5 %, the limits of detection (LODs) are0.05–1.1 ng (1.5–33.9 ng m −3 ), repeatability is 3.5 %–14.5 % andreproducibility is 1.2 %–10.9 %. For the TD approach, the recovery is57.2 %–109.8 %, the LODs are 0.1–1.9 ng (0.04–0.9 ng m −3 ),repeatability is 2.1 %–19.4 % and reproducibility is 1.1 %–12.9 %. Ambientaerosol samples were collected from Beijing, Chengdu, Shanghai andGuangzhou during the winter of 2013 and were analyzed by the two methods.After considering the recoveries, the two methods show a good agreement witha high correlation coefficient ( R2  > 0.98) and a slope closeto unity. The concentrations of n-alkanes, PAHs and hopanes are found to bemuch higher in Beijing than those in Chengdu, Shanghai and Guangzhou, mostlikely due to emissions from traffic and/or coal combustion for wintertimeheating in Beijing.

atmospheric measurement techniques

Determination of n-alkanes, polycyclic aromatic hydrocarbons and hopanes in atmospheric aerosol: evaluation and comparison of thermal desorption GC-MS and solvent extraction GC-MS approaches