Herein,we use an oxidation flow reactor,Gothenburg:Potential Aerosol Mass(Go:PAM)reac-tor,to investigate the secondary organic aerosol(SOA)formation from wheat straw burning.Biomass burning emissions are exposed to high concentrations of hydroxyl radicals(OH)to simulate processes equivalent to atmospheric oxidation of 0-2.55 days.Primary volatile or-ganic compounds(VOCs)were investigated,and particles were measured before and after the Go:PAM reactor.The influence of water content(i.e.5％and 11％)in wheat straw was also explored.Two burning stages,the flaming stage,and non-flaming stages,were identi-fied.Primary particle emission factors(EFs)at a water content of 11％(～3.89 g/kg-fuel)are significantly higher than those at a water content of 5％(～2.26 g/kg-fuel)during the flam-ing stage.However,the water content showed no significant influence at the non-flaming stage.EFs of aromatics at a non-flaming stage(321.8±46.2 mg/kg-fuel)are larger than that at a flaming stage(130.9±37.1 mg/kg-fuel).The OA enhancement ratios increased with the increase in OH exposure at first and decreased with the additional increment of OH expo-sure.The maximum OA enhancement ratio is～12 during the non-flaming stages,which is much higher than～1.7 during the flaming stages.The mass spectrum of the primary wheat burning organic aerosols closely resembles that of resolved biomass burning organic aerosols(BBOA)based on measurements in ambient air.Our results show that large gap(～60％-90％)still remains to estimate biomass burning SOA if only the oxidation of VOCs were included.

Hui Wang;Song Guo;Zhijun Wu;Kai Qiao;Rongzhi Tang;Ying Yu;Weizhao Xu;Wenfei Zhu;Liwu Zeng;Xiaofeng Huang;Lingyan He;Mattias Hallquist

State Key Joint Laboratory of Environmental Simulation and Pollution Control,International Joint Laboratory for Regional Pollution Control,Ministry of Education(IJRC),College of Environmental Sciences and Engineering,Peking University,Beijing 100871,China;Collaborative Innovation Center of Atmospheric Environment and Equipment Technology,Nanjing University of Information Science&Technology,Nanjing 10044,China;Key Laboratory for Urban Habitat Environmental Science and Technology,College of Environment and Energy,Peking University Shenzhen Graduate School,Shenzhen 518055,China;Department of Chemistry and Molecular Biology,Atmospheric Science,University of Gothenburg,SE-412 96 Gothenburg,Sweden

环境科学学报（英文版）

[1]Hui Wang;Song Guo;Zhijun Wu;Kai Qiao;Rongzhi Tang;Ying Yu;Weizhao Xu;Wenfei Zhu;Liwu Zeng;Xiaofeng Huang;Lingyan He;Mattias Hallquist-.Secondary organic aerosol formation from straw burning using an oxidation flow reactor)[J].环境科学学报（英文版）,2022(04):249-258

Gothenburg,flaming,flam

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