Optical properties, chemical functional group, and oxidative activity of different polarity levels of water-soluble organic matter in PM2.5 from biomass and coal combustion in rural areas in Northwest China

Huang, Shasha; Luo, Yu; Wang, Xin; Zhang, Tian; Lei, Yali; Zeng, Yaling; Sun, Jian; Che, Huizheng; Xu, Hongmei; Cao, Junji; Shen, Zhenxing

doi:10.1016/j.atmosenv.2022.119179

Cited by 22 publications

(6 citation statements)

References 82 publications

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“…In contrast, WSOC in larger particles undergoes a series of degradation reactions during the aging process, resulting in a decrease in aromaticity/molecular weight. The MAE 365 values of particles in the size range of < 0.26, 0.44-0.77, 1.40-2.50, and 2.50-10.0 µm were 0.1258, 0.1321, 0.1014, and 0.1145 m 2 g −1 in summer, respectively, and 1.2615, 0.7991, 0.8206, and 0.3707 m 2 g −1 in winter, respectively, indicating that WSOC in smaller particles had stronger light absorption capabilities (Huang et al, 2022). This is because WSOC in smaller particles contained more chromophores, such as nitrogen chromophores (see Sect.…”

Section: Optical Properties At Raw Phmentioning

confidence: 95%

Measurement report: Investigation of pH- and particle-size-dependent chemical and optical properties of water-soluble organic carbon: implications for its sources and aging processes

Qin

Qin²,

Wang³

et al. 2022

Atmos. Chem. Phys.

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Abstract. Knowledge of the chemical structures and optical properties of water-soluble organic carbon (WSOC) is critical considering its involvement in many key aerosol-associated chemical reactions and its potential impacts on climate radiative forcing. This study investigates the coupled effects of pH and particle size on the chemical structures (functional groups) and optical properties (UV/fluorescence properties) of WSOC and further explores the source and aging of WSOC constituents. The results showed that the specific UV absorbance at a wavelength of 254 nm (SUVA254) and mass absorption efficiency at a wavelength of 365 nm (MAE365) were higher in smaller than larger particles, revealing the relatively higher aromaticity/molecular weight and more freshness of WSOC in smaller particles. A decrease in aromaticity/molecular weight of WSOC in larger particles was caused by the degradation reaction that occurred during the aging process. The carboxylic groups tend to be enriched in larger particles, whereas the contribution of phenolic groups was generally higher in smaller particles. The changes in the fluorescence peak position suggested that hydroxyl groups play a leading role in pH-responsive fluorescence in summer, while carboxylic and nitro groups play a dominant role in winter. Overall, the chromophores in smaller particles showed a more pronounced pH dependence, which might be related to the higher content of aromatic species in WSOC in these particle size ranges. Specifically, the climate impact of WSOC would be enhanced with increasing pH. The pH- and particle-size-dependent chemical and optical properties of WSOC provide insights into the structure, source, and aging of WSOC, which will ultimately improve the accuracy of assessing the climate effects of WSOC.

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Section: Optical Properties At Raw Phmentioning

confidence: 95%

Measurement report: Investigation of pH- and particle-size-dependent chemical and optical properties of water-soluble organic carbon: implications for its sources and aging processes

Qin

Qin²,

Wang³

et al. 2022

Atmos. Chem. Phys.

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“…The MAE is the proportion of mass concentration to light absorption, which represents the capacity for reflected light absorption. The capability of WS-BrC to absorb light is measured by MAE 365 , which is unrelated to the inorganic compound's ability to absorb light at low wavelengths (Huang et al 2022). It helps to comprehend how the sample particles scatter.…”

Section: Mass Absorption Efficiency (Mae 365 ) and Refractive Indexmentioning

confidence: 99%

“…The color of BrC compounds appears yellow or brownish (Andreae and Gelencsér 2006). There have been numerous investigations on the emissions of BrC from burning biomass and its optical characteristics (Lei et al 2018, Sun et al 2021, Huang et al 2022. Olson et al (2015) assessed the optical characteristics of BrC emission from biomass and fossil fuels, obtaining the highest MAC (mass absorption cross section) value for BrC emitted from kerosene of 0.37 m 2 g −1 and the lowest value for BrC emitted from peat of 0.07 m 2 g −1 .…”

Section: Introductionmentioning

confidence: 99%

“…The optical characteristics, chemical functional group, and oxidative activity of water-soluble organic matter (WSOM) in PM 2.5 from biomass and coal combustion were determined by Huang et al (2022). They obtained MAE 365 of highly polar WSOM for biomass burning was 0.73 ± 2.13 m 2 g −1 and predicted according to FTIR spectra, polysaccharides, and aromatic compounds predominated in WSOM.…”

Section: Introductionmentioning

confidence: 99%

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Emission of water soluble brown carbon from different combustion sources: optical properties and functional group characterisation

Hossen¹,

Roy²,

Zaman³

et al. 2023

Environ. Res. Commun.

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Brown carbon (BrC) has a large impact on the earth's radiative balance. This study examined BrC's optical characteristics, chemical functional groups, and total organic carbon (TOC) in deposited particulate matter from combustion of biomass, fossil fuels, and mosquito coil. A UV-Vis spectrophotometer was used to assess BrC's optical properties, a TOC analyzer was used to quantify TOC, and attenuated total reflection-fourier transform infrared spectroscopy (ATR-FTIR) was used to identify functional group. The light absorption properties (absorption coefficient (babs-BrC), mass absorption efficiency (MAE365), absorption angstrom exponent (AAE), and refractive index (kabs-BrC)) were determined. Among biomasses, wheat straw exhibited the greatest value of babs-BrC (27.26×103±4.09×103 Mm-1) whereas maize straw had the lowest value of babs-BrC (7.38×103±1.11×103 Mm-1). A higher light absorption coefficient at 365 nm suggested that chromophores contributed more to the process. AAE followed this sequence - mosquito coil (5.46±0.82) > biomass (5.13±1.45) > fossil fuels (2.85±0.32). The highest value of MAE365 (0.99±0.15 m2/gC) and kabs-BrC (0.028±0.004) was obtained in wheat straw, whereas the lowest value of MAE365 (0.07±0.011 m2/gC) and kabs-BrC (0.002) was identified in octane. Biomasses samples showed a strong peak at ~850, ~1368, ~1370, ~1306, and near 1640 cm-1, indicating that the major component of BrC was organic nitrate R-ONO2 which is responsible to increase the light absorption properties. It also contains complex heterocyclic aromatic ring compounds, carbonyl group (C=O), and nitrogen-containing groups such as −2, ≡ . The projected substantial contribution of BrC to overall light absorption is one illustration of the probable climatic effect of biomasses and fossil fuel burning in Southeast Asian region.

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“…HULIS attract attention because of their great burden to climate and public health. 1,2 Worldwide climate warming and drying increase wildre frequency and severity, leading to high regional loading of HULIS-containing smoke pollution originating from near and remote res. Such high smoke episodes lead to deterioration of air quality and exposure to hazardous materials.…”

Section: Introductionmentioning

confidence: 99%

Atmospheric aging modifies the redox potential and toxicity of humic-like substances (HULIS) from biomass burning

Li,

Calderon-Arrieta,

Pardo

et al. 2023

Environ. Sci.: Atmos.

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Optical properties, chemical functional group, and oxidative activity of different polarity levels of water-soluble organic matter in PM2.5 from biomass and coal combustion in rural areas in Northwest China

Cited by 22 publications

References 82 publications

Measurement report: Investigation of pH- and particle-size-dependent chemical and optical properties of water-soluble organic carbon: implications for its sources and aging processes

Measurement report: Investigation of pH- and particle-size-dependent chemical and optical properties of water-soluble organic carbon: implications for its sources and aging processes

Emission of water soluble brown carbon from different combustion sources: optical properties and functional group characterisation

Atmospheric aging modifies the redox potential and toxicity of humic-like substances (HULIS) from biomass burning

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