A
Significant Portion of Water-Soluble Organic Matter
in Fresh Biomass Burning Particles Does Not Contribute to Hygroscopic
Growth: An Application of Polarity Segregation by 1‑Octanol–Water
Partitioning Method
Posted on 2019-08-14 - 13:42
The importance of water-soluble organic
matter (WSOM) on the hygroscopic
growth of particles is recognized, yet roles of different categories
of WSOM are under debate. We segregated WSOM from Indonesian biomass
burning particles by the 1-octanol–water partitioning method.
The method is based on the 1-octanol–water partition coefficient
(KOW), which correlates with water solubility.
The segregated WSOM was analyzed using the humidified tandem differential
mobility analyzer (HTDMA) and time-of-flight aerosol chemical speciation
monitor (ToF-ACSM). Both the hygroscopicity parameter κ and the fractional contribution of m/z 44 (f44), which serves as a metric for
degree of oxygenation, increased with polarity. This result experimentally
evidenced that highly polar/water-soluble OM is highly hygroscopic/oxygenated.
Positive matrix factorization (PMF) identified three factors from
the ToF-ACSM data. Deconvolution of κ by PMF
factors demonstrated that the less polar fractions, which occupy approximately
20–60% of WSOM dependent on the biomass type, almost do not
contribute to water uptake under subsaturated conditions. This result
highlights that categorization of WSOM will be needed to understand
how hygroscopic growth of aerosol particles is regulated.
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Chen, Jing; Lee, Wen-Chien; Itoh, Masayuki; Kuwata, Mikinori (2019). A
Significant Portion of Water-Soluble Organic Matter
in Fresh Biomass Burning Particles Does Not Contribute to Hygroscopic
Growth: An Application of Polarity Segregation by 1‑Octanol–Water
Partitioning Method. ACS Publications. Collection. https://doi.org/10.1021/acs.est.9b01696
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