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Environmental Science. 2016, (04) Core

Analysis of Single Particle Aging and Mixing State at an Agriculture Site（ Quzhou） in the North China Plain in Summer Using a Single Particle Aerosol Mass SpectrometerChinese Full TextEnglish Full Text (MT)

HUANG Zi-long;ZENG Li-min;DONG Hua-bin;LI Mei;ZHU Tong;State Joint Key Laboratory of Environmental Simulation and Pollution Control,College of Environmental Sciences and Engineering,Peking University;State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry,Institute of Atmospheric Physics,Chinese Academy of Sciences;Guangzhou He Xin Analytical Instrument Company Limited;

Abstract: To characterize the size distribution and chemical compositions of ambient particles at an agriculture site in the North of Chinese Plain,a single particle aerosol mass spectrometer（ SPAMS） was deployed from June 30 to July 8,2013. A total of 230 152 particles in the size range of 0. 2-2. 0 μm were chemically analyzed with both positive and negative ion spectra. The results revealed that aerosol could be classified into eight dominant groups,including elemental carbon（ EC,55. 5%）,organic carbon（ OC,10. 7%）,alkalis（ Na-K,17. 4%）,other metals（ 1. 7%）,Fe-rich（ 6. 3%）,Pb-rich（ 3. 1%）,dust（ 4. 8%）,and other（ 0. 8%）. The observed eight types of particles contained secondary components such as46NO-2,62NO-3,80SO-3,96SO-4,97HSO-4,showing that they probably went through different aging processes. The analysis of particle size distribution showed that 700-800 nm was the peak value of all particles,and that dust and Fe particles were mainly in the coarse size range. EC particles subtype group research revealed EC particles tended to be aging with the above mentioned secondary ions and eventually led to a particle type conversion from EC to the less aging ECN and the more serious aging ECS,the diurnal variation of which was obviously negatively correlated,and there was a possibility of forming OC / EC mixture with the adsorption of secondary organic matter on EC surface.
Keywords：

single particle; aerosol composition; particle size; mixing state; single particle aerosol mass spectrometry（SPAMS）;

  • DOI：

    10.13227/j.hjkx.2016.04.002

  • Series：

  • Subject：

  • Classification Code：

    X513

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