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Identification of secondary organic aerosols based on aerosol mass spectrometry

中国科学：化学英文版 2010年第12期53卷 2593-2599页

作者： huang xiaofeng 1,zhao qianbiao 1,{2.,hu min 2.bian qijing 3,xue lian 1 & zhang yuanhang 2.1 key laboratory for urban {12. Environmental science and technology School of Environment and Energy,Peking University Shenzhen Graduate School,Shenzhen 518055,China 2.State key Joint laboratory of Environmental Simulation and Pollution Control College of Environmental sciences and Engineering,Peking University,Beijing 100871,China 3 Division of Environment,Hong Kong University of science & technology,Hong Kong,China 1. key laboratory for {2. habitat Environmental science and technology School of Environment and Energy Peking University Shenzhen Graduate School Shenzhen 518055 China2. State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental sciences and Engineering Peking University Beijing 100871 China3. Division of Environment Hong Kong University of Science & Technology Hong Kong China

Secondary organic aerosol (SOA) is one of the major components of aerosols in the atmosphere and has not been well understood so *** to the complex chemical composition of organic aerosols,the identification of SOA has been a hotspot and difficult issue in the field of aerosol *** study attempts to quantitatively identify SOA in winter of Shenzhen based on positive matrix factorization (PMF) *** sources were resolved and SOA was identified subsequently according to the characteristic ion fragments measured by highly time-resolved aerosol mass spectrometer *** showed that in the winter of Shenzhen the average SOA concentration was 9.41±6.33 g/m 3,accounting for 39.9±2..8% of the total organic *** with primary organic aerosol (POA),the SOA concentrations had no large variation,suggestive of characteristics of regional secondary *** ratio of SOA/BC had pronounced diurnal variation,similar to that of O x (O3+NO2.,indicating SOA formation was significantly controlled by activity of photochemistry in the *** most effective period for SOA formation was from 9 am～3 pm since the SOA/BC ratio increased by 12.% during this *** study provides a new technical method and a new idea for SOA investigation.

关键词： secondary organic aerosol aerosol mass spectrometry positive matrix factorization (PMF)

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