Special Issue on 10th International Conference on Acid Deposition (Acid Rain 2020) (III)

Titinan Utavong1, Thunyapat Thongyen This email address is being protected from spambots. You need JavaScript enabled to view it.1, Surat Bualert2, Parkpoom Choomanee2, Saranarat Kongkeaw2,4, Tanawan Rattanapotanan1, Jitlada Phupijit2,3, Suteekan Maneejantra2, Nitchakarn Changplaiy2 

1 Department of Environmental Technology and Management, Faculty of Environment, Kasetsart University, Bangkok 10900, Thailand
2 Department of Environmental Science, Faculty of Environment, Kasetsart University, Bangkok 10900, Thailand
3 The Regional Integrated Multi-Hazard Early Warning System, AIT Campus, Pathumthani 12120, Thailand
4 TPI Polene (Public) Co., Ltd., Saraburi 18260, Thailand

Received: September 30, 2023
Revised: January 31, 2024
Accepted: April 7, 2024

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

Download Citation: ||https://doi.org/10.4209/aaqr.230234  

Cite this article:

Utavong, T., Thongyen, T., Bualert, S., Choomanee, P., Kongkeaw, S., Rattanapotanan, T., Phupijit, J., Maneejantra, S., Changplaiy, N. (2024). Influence of Relative Humidity and Aging on Morphology and Chemical Composition on Biomass Burning Particle. Aerosol Air Qual. Res. 24, 230234. https://doi.org/10.4209/aaqr.230234


  • Aging process, relative humidity, and duration affect particulate properties.
  • Changes in the chemical compositions of fine particulate matter were analyzed.
  • OC2, OC3, OC4, NO3, Na+, K+, Mg2+, and SO42− had the most dominant concentrations.


Agricultural waste burning is a major source of fine particulate matter (FPM), which remains in long-term suspension in the atmosphere during the aging processes. This research studied changes in the size, morphology, and chemical composition of FPM produced from rice straw and sugarcane leaf burning and the effects of relative humidity (RH) on the aging process. The FPM was measured using a scanning mobility particle sizer and the particle mass was collected for morphological (transmission electron microscopy) and chemical (organic and elemental carbon, and water-soluble ions) analyses during 3, 6, and 9 h of aging. The geometric mean diameter (GMDN) of FPM from biomass burning were 95 ± 4 nm (Aitken mode) and 133 ± 40 nm (accumulation mode). The FPM changed from non-uniform and aggregate shapes in fresh particles into chain aggregates in 9 h-aged particles. The dominant chemical components of FPM were OC2, OC3, NO3, Na+, and K+ under low RH condition (60%). Under high RH condition (90%), the FPM had a larger GMDN and a significant influence on its morphology, as observed in coated spherical or agglomerated shapes. The results showed that the aging process, RH, and aging duration were important factors affecting the size, shape, and chemical composition of aged particles.

Keywords: Aging process, Fine particulate matter (FPM), Rice straw, Size distribution, Sugarcane leaves

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