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Online single particle analysis of chemical composition and mixing state of crop straw burning particles： from laboratory study to field measurement

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Frontiers of Environmental Science & Engineering 2016年第2期10卷 244-252页

作者： Juntao HUO Xiaohui LU Xinning WANG Hong CHEN Xingnan YE Song Gao Deborah S. Gross Jianmin CHEN Xin YANG Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention Department of Environmental Science and Engineering Fudan University Shanghai 200433 China Division of Math Science and Technology Nova Southeastern University Fort Lauderdale FL 33314 USA Department of Chemistry Carleton College Northfield MN 55057 USA Fudan-Tyndall Center Fudan University Shanghai 200433 China

Fresh straw burning （SB） particles were generated in the laboratory by the combustion of rice straw and corn straw. The chemical composition and mixing state of the fresh SB particles were investigated by an Aerosol Time-of-Flight Mass Spectrometer （ATOFMS）. Based on the mass spectral patterns, the SB particles were clustered into four major types： Salt, Organic Carbon （OC）, Elemental Carbon （EC）, and internally mixed particles of EC and OC （EC-OC）. In addition, particles containing ash, polycyclic aromatic hydrocarbons, heavy metals or nicotine were also observed. Physical and chemical changes of the SB particles immediately after the emission were analyzed with highly time-resolved data. During the aging processes, the average particle size increased steadily. Freshly emitted organic compounds were gradu- ally oxidized to more oxygenated compounds in the OC- containing particles. Meanwhile, an important displace- ment reaction （2KCI＋ SO24- KzSO4 ＋ 2C1-） was observed. The marker ions for SB particles were optimized and applied to identify the SB particles in the ambient atmosphere. The fluctuation of the number fraction of ambient SB particles sorted by ATOFMS agrees well with that of water soluble K＋ measured by an online ion chromatography, demonstrating that the optimized marker ions could be good tracers for SB particles in field measurements.

关键词： crop straw burning particles mixing state,aging process ATOFMS ion markers

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