Simultaneous measurements of aerosol size, distribution of number, mass, and chemical compositions were conducted in the winter of 2007 in Beijing using a Twin Differential Mobility Particle Sizer and a Micro Orifice Uniform Deposit Impactor. Both material density and effective density of ambient particles were estimated to be 1.61 ± 0.13 g cm-3 and 1.62 ± 0.38 g cm-3 for PM1.8 and 1.73 ± 0.14 g cm-3 and 1.67 ± 0.37 g cm-3 for PM10. Effective density decreased in the nighttime, indicating the primary particles emission from coal burning influenced the density of ambient particles. Size-resolved material density and effective density showed that both values increased with diameter from about 1.5 g cm-3 at the size of 0.1 μm to above 2.0 g cm -3 in the coarse mode. Material density was significantly higher for particles between 0.56 and 1.8 μm during clean episodes. Dynamic Shape Factors varied within the range of 0.95-1.13 and decreased with particle size, indicating that coagulation and atmospheric aging processes may change the shape of particles. © 2012 American Chemical Society.
CITATION STYLE
Hu, M., Peng, J., Sun, K., Yue, D., Guo, S., Wiedensohler, A., & Wu, Z. (2012). Estimation of size-resolved ambient particle density based on the measurement of aerosol number, mass, and chemical size distributions in the winter in Beijing. Environmental Science and Technology, 46(18), 9941–9947. https://doi.org/10.1021/es204073t
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