Phase States Linking with Chemical Composition of PM2.5 in Northeast Asia
CHANGJOON SEONG, Daeun Kim, Rani Jeong, Yanting Qiu, Zhijun Wu, Changhyuk Kim, Kyoung-Soon Jang, Ji Yi Lee, Kwangyul Lee, Joonyoung Ahn, Amgalan Natsagdorj, Mijung Song,
Jeonbuk National University Abstract Number: 92
Working Group: Aerosol Physics
AbstractThe phase state and chemical composition of aerosol particles are key factors affecting their properties and behavior. However, there is a lack of information regarding the impact of chemical composition on the phase state of particulate matter (PM). To address this gap, we investigated how chemical composition affects the phase state of fine PM (PM
2.5) in four prominent cities: Seoul, Seosan, Beijing, and Ulaanbaatar, during the period from December 2020 to April 2022. We analyzed a total of 92 PM
2.5 filter samples using optical observation techniques and the Poke and Flow method to investigate the impact of chemical composition on the phase state of PM
2.5. Our research findings revealed that the range in which PM
2.5 can exist in liquid and semi-solid states may vary depending on the chemical composition. Specifically, we found that the ratio of nitrate and sulfate in the particle's chemical composition can have an impact on its phase state. By focusing on the impact of aerosol chemical characteristics on the phase state, this study contributes to our understanding of how phase state and chemical composition influence atmospheric pollution.