Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/146630
Title: Polarity-dependent chemical characteristics of water-soluble organic matter from laboratory-generated biomass-burning revealed by 1-octanol-water partitioning
Authors: Lee, Wen-Chien
Chen, Jing
Budisulistiorini, Sri Hapsari
Itoh, Masayuki
Shiodera, Satomi
Kuwata, Mikinori
Keywords: Science::Chemistry
Issue Date: 2019
Source: Lee, W.-C., Chen, J., Budisulistiorini, S. H., Itoh, M., Shiodera, S., & Kuwata, M. Polarity-dependent chemical characteristics of water-soluble organic matter from laboratory-generated biomass-burning revealed by 1-octanol-water partitioning. Environmental Science and Technology, 53(14), 8047-8056. doi:10.1021/acs.est.9b01691
Project: NRF2012NRF-NRFF001-03
Journal: Environmental Science and Technology 
Abstract: Polarity distribution of water-soluble organic matter (WSOM) is an important factor in determining the hygroscopic and cloud nucleation abilities of organic aerosol particles. We applied a novel framework to quantitatively classify WSOM based on the 1-octanol-water partition coefficient (KOW), which often serves as a proxy of polarity. In this study, WSOM was generated in a laboratory biomass-burning experiment by smoldering of Indonesian peat and vegetation samples. The fractionated WSOM was analyzed using a UV-visible spectrophotometer, spectrofluorometer, and time-of-flight aerosol chemical speciation monitor. Several deconvolution methods, including positive matrix factorization, parallel factor analysis, and least-squares analysis, were applied to the measured spectra, resulting in three classes of WSOM. The highly polar fraction of WSOM, which predominantly exists in the range of log KOW < 0, is highly oxygenated and exhibits similar optical properties as those of light-absorbing humic-like substances (HULIS, termed after the humic substances due to the similarity in chemical characteristics). WSOM in the least-polar fraction, which mainly distributes in log KOW > 1, mostly consists of hydrocarbon-like and high molecular weight species. In between the most- and least-polar fraction, WSOM in the marginally polar fraction likely contains aromatic compounds. The analyses have also suggested the existence of HULIS with different polarities. Comparison with previous studies indicates that only WSOM in the highly polar fraction (log KOW < 0) likely contributes to water uptake.
URI: https://hdl.handle.net/10356/146630
ISSN: 0013-936X
DOI: 10.1021/acs.est.9b01691
Rights: © 2019 American Chemical Society. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:SPMS Journal Articles

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