Chemical and Absorption Characteristics of Water-soluble Organic Carbon and Humic-like Substances in Size-segregated Particles from Biomass Burning Emissions

Myeong, Yu Jae; Hye, Yu Geun; Park, Seungshik; Bae, Min‐Suk

doi:10.5572/ajae.2017.11.2.096

Cited by 22 publications

(9 citation statements)

References 42 publications

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“…The calculated AAE values for the fresh and irradiated samples are summarized inside Figure 2a. The AAE values of the fresh samples are typical for WSOC and comparable to biomass burning samples from other studies, for example, Yu et al (2017). In addition, given that, AAE of pure black carbon is unity (Kirchstetter, Novakov, and Hobbs 2004), the effective light absorption by the fresh samples was greater in the 280-400 nm interval relative to that in the 400-500 nm interval.…”

Section: Macsupporting

confidence: 74%

Dynamic response of light absorption by PM2.5 bound water-soluble organic carbon to heterogeneous oxidation

Ray

Singh

Ghosh

et al. 2019

Aerosol Science and Technology

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Along with greenhouse gases, worldwide biomass-burning events add substantial amounts of a complex optical system consisting of elemental carbon and organic particulate matter to the atmosphere. These particulate matters significantly affect the Earth's radiation balance as well as perturb the precipitation pattern. Considerable attention has been given to the impact of physicochemical transformation or aging on the optical properties of aqueous solution (a homogeneous medium) of light-absorbing fractions of the organic particulate matter. However, their heterogeneous photochemical aging remains largely unexplored. This experimental study explores heterogeneous absorbance photo-bleaching kinetics of the water-soluble organic-carbon (WSOC) intrinsic to PM 2:5 from rice straw smoldering smoke. In the wavelength region of 280-400 nm, the absorption ability decreased consistently with aging while a characteristic initial increase of absorption was observed in the 400-500 nm intervals, which again decreased with further aging. The dynamic light absorptivity of the WSOC may not be related to the corresponding mass concentrations. The relative quantum efficiency of the heterogeneous aging of these WSOC was estimated to be (0.01-0.3) %. The kinetic results suggest that their half-life could be nearly a week under ambient solar radiation.

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Section: Macsupporting

confidence: 74%

Dynamic response of light absorption by PM2.5 bound water-soluble organic carbon to heterogeneous oxidation

Ray

Singh

Ghosh

et al. 2019

Aerosol Science and Technology

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“…The condensation mode NO 3 and SO 4 2concentrations accounted for 27.6 and 34.0% of their total concentration, respectively. Furthermore, coexistence of condensation mode WSOC and K + suggests the impact of BB emissions [54,55]. The condensation mode WSOC and K + contributed 35.3 and 20.3% to the total WSOC and K + , respectively.…”

Section: Size Distribution Of Water-soluble Chemical Species and Its mentioning

confidence: 93%

“…in Table 3. Organic markers such as WSOC and oxalate were used to investigate the influence of secondary organic aerosols on light absorption by BrC aerosols [4], while the water-soluble K + was used to examine the influence from BB emissions on the BrC absorption [54,55,57]. As shown in Table 3, BrC b abs,370 had moderate-to-strong correlations with size-resolved WSOC with R 2 values ranging from 0.56 to 0.73 and size-resolved oxalate with R 2 values of 0.51-0.81, respectively.…”

Section: -mentioning

confidence: 99%

Absorption properties and size distribution of aerosol particles during the fall season at an urban site of Gwangju, Korea

Park¹,

Yu²

2018

Environmental Engineering Research

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To investigate the influence of pollution events on the chemical composition and formation processes of aerosol particles, 24-h integrated size-segregated particulate matter (PM) was collected during the fall season at an urban site of Gwangju, Korea and was used to determine the concentrations of mass, water-soluble organic carbon (WSOC) and ionic species. Furthermore, black carbon (BC) concentrations were observed with an aethalometer. The entire sampling period was classified into four periods, i.e., typical, pollution event I, pollution event II, and an Asian dust event. Stable meteorological conditions (e.g., low wind speed, high surface pressure, and high relative humidity) observed during the two pollution events led to accumulation of aerosol particles and increased formation of secondary organic and inorganic aerosol species, thus causing PM2.5 increase. Furthermore, these stable conditions resulted in the predominant condensation or droplet mode size distributions of PM, WSOC, NO3-, and SO4 2-. However, difference in the accumulation mode size distributions of secondary water-soluble species between pollution events I and II could be attributed to the difference in transport pathways of air masses from high-pollution regions and the formation processes for the secondary chemical species. The average absorption Ångström exponent (AAE370-950) for 370-950 nm wavelengths > 1.0 indicates that the BC particles from traffic emissions were likely mixed with light absorbing brown carbon (BrC) from biomass burning (BB) emissions. It was found that light absorption by BrC in the near UV range was affected by both secondary organic aerosol and BB emissions. Overall, the pollution events observed during fall at the study site can be due to the synergy of unfavorable meteorological conditions, enhanced secondary formation, local emissions, and long-range transportation of air masses from upwind polluted areas.

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“…Size distributions of WSOC are explored for years (Deshmukh et al, 2016;Frka et al, 2018), the mass concentrations of WSOC generally show bimodal distributions with dominant in accumulation mode (0.05-2µm) (Yu et al, 2004;Yu et al, 2016). Structural investigations on coal burning and biomass burning affected humic-like substances (great parts of WSOC) of four particle sizes found that organic species of all samples were basically the same without size discrepancy, but the absorption bands of aromatic groups were more intense comparing to carboxylic groups in sub-3 µm fractions (ParkSeungShik et al, 2017;Voliotis et al, 2017). Jang et al, (2019) comprehensively analyzed the structures of sizesegregated humic-like substances during pre-heating, heating, and after heating periods, found that CHO, CHON, and CHOS increased in the heating period.…”

mentioning

confidence: 92%

“…Generally, WSOC mixture contains both aromatic nuclei and aliphatic chains (Decesari et al, 2001;Dasari et al, 2019), incorporating with different highly oxidized functional groups or heteroatoms like hydroxyl, carboxyl, aldehyde, ketone, amino, and other nitrogencontaining groups (Duarte et al, 2007;Cai et al, 2020). Biomass burning and secondary transformations of organics were believed to be the main sources of WSOC (ParkSeungShik et al, 2017;Xiang et al, 2017).…”

mentioning

confidence: 99%

Particle size-dependent fluorescence properties of water-soluble organic compounds (WSOC) and their atmospheric implications on the aging of WSOC

Qin

Tan

Zhou

et al. 2021

Preprint

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Abstract. Water-soluble organic compounds (WSOC) are essential in atmospheric particle formation, migration, and transformation processes. Size-segregated atmospheric particles were collected in a rural area of Beijing. Excitation-emission matrix (EEM) fluorescence spectroscopy was used to investigate the sources and optical properties of WSOC. Sophisticated data analysis on EEM data was performed to characteristically estimate the underlying connections among aerosol particles in different sizes. The WSOC concentrations and average fluorescence intensity (AFI) showed monomodal distribution in winter and bimodal distribution in summer, with dominant mode between 0.26 to 0.44 µm for both seasons. The EEM spectra of size-segregated WSOC were different among variant particle sizes, which could be the results of changing sources and/or chemical transformation of organics. Size distributions of fluorescence regional intensity (region Ⅲ and Ⅴ) and HIX indicate that humification degree or aromaticity of WSOC was highest between 0.26 to 0.44 µm. The Stokes shift (SS) and the harmonic mean of the excitation and emission wavelengths (WH) reflected that π-conjugated systems were high between 0.26 to 0.44 µm as well. The parallel factor analysis (PARAFAC) results showed that humic-like substances were abundant in fine particles (< 1 µm) and peaked at 0.26–0.44 µm. All evidence supported that the humification degree of WSOC increased in submicron mode (< 0.44 µm) and decreased gradually. Thus, it was conjectured that condensation of organics still goes on in submicron mode, resulting in the highest humification degree exhibit in particle size between 0.26 to 0.44 µm rather than < 0.26 µm. Synthetically analyzing 3-dimensional fluorescence data could efficiently present the secondary transformation processes of WSOC.

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Chemical and Absorption Characteristics of Water-soluble Organic Carbon and Humic-like Substances in Size-segregated Particles from Biomass Burning Emissions

Cited by 22 publications

References 42 publications

Dynamic response of light absorption by PM2.5 bound water-soluble organic carbon to heterogeneous oxidation

Dynamic response of light absorption by PM2.5 bound water-soluble organic carbon to heterogeneous oxidation

Absorption properties and size distribution of aerosol particles during the fall season at an urban site of Gwangju, Korea

Particle size-dependent fluorescence properties of water-soluble organic compounds (WSOC) and their atmospheric implications on the aging of WSOC

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