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Composition of secondary organic aerosol and its contributions to organic carbon in PM2.5
Received date: 2016-01-11
Online published: 2016-04-30
PM2.5 samples collected during summer were analyzed with gas chromatographymass spectrometry (GC/MS). The purposes were to study the concentration levels and influence factors of secondary organic aerosol (SOA) formation, and estimate the contributions of secondary organic carbon (SOC) to organic carbon (OC) using a tracer-yield method. Isoprene tracers had a large percentage of total SOA tracers, which were 31.3% to 52.2%. The dominant isoprene tracer was 2-methylglyceric acid. -pinene SOA tracers had a small percentage of total SOA tracers, which were 16.4% to 35.8%. Concentration
of toluene tracers ranged from 6.49 to 12.60 ng/m3, higher than Baoshan, Shanghai and Hong Kong, China, and lower than Beijing and Guangzhou. The contributions of SOC of toluene to OC were 11.5%～17.7% and SOC of toluene were important parts of SOC, indicating that anthropogenic emissions were important sources of air pollution. Positive correlation existed between SOA tracers and O3, indicating that O3 had great influence on
SOC formation.
Key words： organic carbon (OC); PM2.5; secondary organic aerosol (SOA)
JU Fashuai, WANG Xintong, HAN Dewen, WANG Wu . Composition of secondary organic aerosol and its contributions to organic carbon in PM2.5[J]. Journal of Shanghai University, 2016 , 22(2) : 172 -180 . DOI: 10.3969/j.issn.1007-2861.2016.01.021
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