Effects of Volatile Components on Mixing State and Size Distribution of Individual Black Carbon Aerosols

Li, Kangning1; Wang, XiaoFei2; Lu, Xiaohui2; Chen, Hong2; Yang, Xin3

2022-04-01

10.4209/aaqr.210400

Aerosol and Air Quality Research   影响因子和分区

1680-8584

2071-1409

In this study, the effects of different volatile components on the mixing state and size distribution of ambient individual black carbon (BC) aerosols were measured using thermo-denudation with single-particle soot photometry and single-particle aerosol mass spectrometry from September 9 to September 27, 2018, in Shanghai, China. The volatility, chemical composition, size distribution, and core-shell structure of BC aerosol were also analysed. To understand the influence of heating temperature on the BC core-shell structure, the mixing state of ageing particles at room temperature (25 degrees C) and the mixing state of residual material heated to 150 degrees C and 300 degrees C were analysed. BC was internally mixed with secondary components, such as ammonium nitrate, ammonium sulphate, a small amount of sodium nitrate, potassium nitrate, sodium sulphate and potassium sulphate, and other nonvolatile components. At 300 degrees C, the secondary components with low volatility escaped, resulting in a thinner BC coating. However, several low-volatile non-BC substances remained, namely organic species, potassium chloride, potassium nitrate, and other nonvolatile substances. The extremely strong photochemical reaction may have produced large amounts of secondary organic carbon on the BC surface in the afternoon, with the high temperature volatilising the whole particle. However, fresh BC particles emitted from traffic during morning rush hour had ultralow volatility, with relatively fewer low-volatile components on the surface.

Black carbon Mixing state Size distributions Volatility

SCI ; EI

英语

通讯

National Natural Science Foundation of China (NSFC)[NSFC-42167016] ; Key Research and Development Program of Ningxia Province in China[2020BEB04003]

Environmental Sciences & Ecology

Environmental Sciences

WOS:000773359600004

TAIWAN ASSOC AEROSOL RES-TAAR

20221511963184

Aerosols ; Chlorine compounds ; Mass spectrometry ; Mixing ; Nitrates ; Organic carbon ; Potassium Nitrate ; Shells (structures) ; Size distribution ; Sodium nitrate ; Sulfur compounds

Structural Members and Shapes:408.2 ; Chemistry:801 ; Chemical Operations:802.3 ; Organic Compounds:804.1 ; Inorganic Compounds:804.2 ; Mathematical Statistics:922.2

Web of Science

1.Ningxia Univ, Ningxia Key Lab Intelligent Sensing Desert Inform, Sch Phys & Elect Elect Engn, Yinchuan 750021, Ningxia, Peoples R China
2.Fudan Univ, Dept Environm Sci & Engn, Shanghai Key Lab Atmospher Particle Pollut & Prev, Shanghai 200433, Peoples R China
3.Southern Univ Sci & Technol, Sch Environm Sci & Engn, Shenzhen 518055, Peoples R China

Li, Kangning,Wang, XiaoFei,Lu, Xiaohui,et al. Effects of Volatile Components on Mixing State and Size Distribution of Individual Black Carbon Aerosols[J]. Aerosol and Air Quality Research,2022,22(4).

Li, Kangning,Wang, XiaoFei,Lu, Xiaohui,Chen, Hong,&Yang, Xin.(2022).Effects of Volatile Components on Mixing State and Size Distribution of Individual Black Carbon Aerosols.Aerosol and Air Quality Research,22(4).

Li, Kangning,et al."Effects of Volatile Components on Mixing State and Size Distribution of Individual Black Carbon Aerosols".Aerosol and Air Quality Research 22.4(2022).