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- Title
Analysis of the Differential Effects of Aerosol pH Variation on Aerosol Activity Coefficients for Different Particle Sizes.
- Authors
WEI Zhe; XU Ruiguang; LIANG Chao; LI Huan; WANG Litao
- Abstract
The acidity of aerosols is closely related to various atmospheric activities such as aerosol formation, gas-particle partitioning, deposition flux, and nutrient transport. In this study, continuous one-year monitoring of PM2.5, PM2.5-10, and their components was conducted in Handan City, Hebei Province from March 2015 to February 2016 using ACSA-14. The study revealed that the annual mean concentration of PM2.5 in Handan was 142.2 µg/m³, exceeding that of PM2.5-10, which measured at 77.0 µg/m³. PM2.5 constituted 64.9% of PM10. Additionally, the proportions of sulfate, nitrate, and soluble organic compounds in PM2.5 were higher than those in PM2.5-10, with annual mean values of 15.5 µg/m³, 17.5 µg/m³, and 9.8 µg/m³, respectively. Both PM2.5 and PM2.5-10 exhibited moderate acidity, with respective pH values of 4.5 and 4.3, and they were more acidic during the spring and winter. The activity coefficients of nitrate in PM2.5 were lower, making nitrate more readily partition into the particulate phase. Increasing the pH facilitated the transfer of nitrate into the particulate phase, and the effect of pH on the activity coefficients of sulfate, nitrate, and ammonium displayed significant seasonal variations. During winter, the activity coefficients of sulfate, nitrate, and ammonium showed a slight increase, with nitrate and ammonium displaying stronger alkaline values in the winter months. This stronger alkalinity facilitated the rapid transition of sulfate into the liquid phase, allowing it to engage in chemical reactions within the liquid phase. These findings hold significant implications for understanding the characteristics and formation mechanisms of atmospheric particulate matter in Handan.
- Subjects
HEBEI Sheng (China); ACTIVITY coefficients; PH effect; PARTICULATE nitrate; AEROSOLS; ATMOSPHERIC aerosols; CARBONACEOUS aerosols
- Publication
Environmental Science & Technology (10036504), 2023, Vol 46, Issue 10, p138
- ISSN
1003-6504
- Publication type
Article
- DOI
10.19672/j.cnki.1003-6504.1033.23.338