The results showed that BC-dominated particles whose BC core mass (~2.2 fg) was almost equal to particle mass (~2.3 fg) were observed in particles with 200 nm D a. The BC particles were either classified as “BC-dominated particle” which is mainly made of black carbon or “BC-mixed particle” which is a mixture of both BC and non-BC substances. A method, combining an aerodynamic aerosol classifier (AAC), a differential mobility analyzer (DMA), a single-particle soot photometer (SP2) and a single particle aerosol mass spectrometer (SPAMS), was developed to determine the density and dynamic shape factor ( χ) of ambient BC particles with three different aerodynamic diameters ( D a, 200 nm, 350 nm, and 500 nm) in Shanghai, China, a typical urban area. The particle density and morphology are often needed to investigate the mixing state and aging process of BC particles. Condensation of sulfates and nitrates contributed to the aging process of BC.īlack carbon (BC) aerosol imposes adverse effects on atmospheric visibility, climate, and health.BC-dominated aerosol was near-spherical, suggesting rapid aging of fresh BC. The density and shape of single black carbon particle was investigated.Measurement of Density and Shape for Single Black Carbon Aerosols in a Heavily Polluted Urban Area.
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