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Mixing state of ambient aerosols in Nanjing city by single particle mass spectrometry
Abstract To investigate the mixing state and size-resolved aerosol in Nanjing, measurements were carried out for the period 14th January-1st February 2013 by using a Single Particle Aerosol Mass Spectrometer (SPAMS). A total of 10,864,766 particles were sized with vacuum aerodynamic diameter (dva) in the range of 0.2–2.0 μm. Of which, 1,989,725 particles were successfully ionized. Aerosol particles employed for analyzing SPAMS data utilized 96% of the hit particles to identify 5 main particle groups. The particle classes include: K-rich particles (K-CN, K-Nitrate, K-Sulfate and K-Secondary), sodium particles, ammonium particles, carbon-rich particles (OC, EC and OCEC) and heavy-metal particles (Fe-Secondary, Pb-Nitrate, Cu-Mn-Secondary and V-Secondary). EC was the largest contributor with a fraction of 21.78%, followed by K-Secondary (17.87%), K-Nitrate (12.68%) and K-CN (11.25%). High particle level and high RH (relative humidity) are two important factors decreasing visibility in Nanjing. Different particle classes have distinct extinction effects. It anti-correlated well with visibility for the K-secondary, sodium, ammonium, EC, Fe-Secondary and K-Nitrate particles. The proportion of EC particles at 0.65–1.4 μm was up to 25% on haze days and was below 10% on clean days.
Highlights SPAMS was used to characterize over 1,989,725 single particles. K-rich particles accounted for 44.68% of the total hit particles. Different chemical components have distinct extinction effects. Proportion of EC particles at 0.65–1.4 μm was up to 25% on haze days.
Mixing state of ambient aerosols in Nanjing city by single particle mass spectrometry
Abstract To investigate the mixing state and size-resolved aerosol in Nanjing, measurements were carried out for the period 14th January-1st February 2013 by using a Single Particle Aerosol Mass Spectrometer (SPAMS). A total of 10,864,766 particles were sized with vacuum aerodynamic diameter (dva) in the range of 0.2–2.0 μm. Of which, 1,989,725 particles were successfully ionized. Aerosol particles employed for analyzing SPAMS data utilized 96% of the hit particles to identify 5 main particle groups. The particle classes include: K-rich particles (K-CN, K-Nitrate, K-Sulfate and K-Secondary), sodium particles, ammonium particles, carbon-rich particles (OC, EC and OCEC) and heavy-metal particles (Fe-Secondary, Pb-Nitrate, Cu-Mn-Secondary and V-Secondary). EC was the largest contributor with a fraction of 21.78%, followed by K-Secondary (17.87%), K-Nitrate (12.68%) and K-CN (11.25%). High particle level and high RH (relative humidity) are two important factors decreasing visibility in Nanjing. Different particle classes have distinct extinction effects. It anti-correlated well with visibility for the K-secondary, sodium, ammonium, EC, Fe-Secondary and K-Nitrate particles. The proportion of EC particles at 0.65–1.4 μm was up to 25% on haze days and was below 10% on clean days.
Highlights SPAMS was used to characterize over 1,989,725 single particles. K-rich particles accounted for 44.68% of the total hit particles. Different chemical components have distinct extinction effects. Proportion of EC particles at 0.65–1.4 μm was up to 25% on haze days.
Mixing state of ambient aerosols in Nanjing city by single particle mass spectrometry
Wang, Honglei (author) / An, Junlin (author) / Shen, Lijuan (author) / Zhu, Bin (author) / Xia, Li (author) / Duan, Qing (author) / Zou, Jianan (author)
Atmospheric Environment ; 132 ; 123-132
2016-02-19
10 pages
Article (Journal)
Electronic Resource
English
Haze , SPAMS , Mixing state , Nitrate , Visibility , Nanjing