TY - JOUR
T1 - Light absorption properties and molecular profiles of HULIS in PM2.5 emitted from biomass burning in traditional “Heated Kang” in Northwest China
AU - Zhang, Tian
AU - Shen, Zhenxing
AU - Zeng, Yaling
AU - Cheng, Conglan
AU - Wang, Diwei
AU - Zhang, Qian
AU - Lei, Yali
AU - Zhang, Yue
AU - Sun, Jian
AU - Xu, Hongmei
AU - Ho, Steven Sai Hang
AU - Cao, Junji
N1 - Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/7/1
Y1 - 2021/7/1
N2 - Humic-like substances (HULIS) in PM2.5 emitted from biomass burning (BB), including maize cob, wheat straw, maize straw, wood branch, and wood, in a traditional “Heated Kang” were investigated. The relative abundances, optical properties, chemical functional groups, and molecular components in HULIS were characterized using total organic carbon (TOC) analyzer, ultraviolet–visible spectroscopy (UV–vis), Fourier-transform infrared spectroscopy (FT-IR), and Fourier-transform ion cyclotron resonance mass spectrometer (FT-ICR/MS), respectively. The emission factors (EF) of HULIS-C (in term of carbon weight, EFHULIS-C) from BB were in the range of 0.83 to 5.17 g/kg fuel, with a mean value of 1.93 ± 1.31 g/kg fuel. The HULIS-C accounted for 15.0–37.8% and 9.1–12.6% of fractions in organic carbon (OC) and PM2.5, respectively, suggesting that BB is an important emission source of atmospheric HULIS. The FT-IR spectra showed BB HULIS mainly contain O-containing, aliphatic C[sbnd]H, and aromatic C[dbnd]C functional groups. The presences of carboxyl group and O[sbnd]H band demonstrated the uniqueness of maize straw and wood burning. Moreover, the higher ratio of CH3 and -CH2 groups could be used to distinguish the wood branches from the maize cob. CHO and CHON were much dominant in BB HULIS, which accounted for 44.6–47.6% and 50.1–54.2%, respectively, to the total molecular mass. The positive correlation between MAE365 and AAE in term of number concentration of CHNO implied that the CHNO species could greatly influence on the light absorption properties of the BB HULIS. The CHO and S-containing compounds (i.e., CHNOS and CHOS, that is CHNOS+CHOS) showed weak light absorbances of the BB HULIS. The BB HULIS from maize straw had relatively high molecular weight in comparison to that in other BB emissions. The highest and lowest aromaticity were seen on the wood burning and maize cob, respectively.
AB - Humic-like substances (HULIS) in PM2.5 emitted from biomass burning (BB), including maize cob, wheat straw, maize straw, wood branch, and wood, in a traditional “Heated Kang” were investigated. The relative abundances, optical properties, chemical functional groups, and molecular components in HULIS were characterized using total organic carbon (TOC) analyzer, ultraviolet–visible spectroscopy (UV–vis), Fourier-transform infrared spectroscopy (FT-IR), and Fourier-transform ion cyclotron resonance mass spectrometer (FT-ICR/MS), respectively. The emission factors (EF) of HULIS-C (in term of carbon weight, EFHULIS-C) from BB were in the range of 0.83 to 5.17 g/kg fuel, with a mean value of 1.93 ± 1.31 g/kg fuel. The HULIS-C accounted for 15.0–37.8% and 9.1–12.6% of fractions in organic carbon (OC) and PM2.5, respectively, suggesting that BB is an important emission source of atmospheric HULIS. The FT-IR spectra showed BB HULIS mainly contain O-containing, aliphatic C[sbnd]H, and aromatic C[dbnd]C functional groups. The presences of carboxyl group and O[sbnd]H band demonstrated the uniqueness of maize straw and wood burning. Moreover, the higher ratio of CH3 and -CH2 groups could be used to distinguish the wood branches from the maize cob. CHO and CHON were much dominant in BB HULIS, which accounted for 44.6–47.6% and 50.1–54.2%, respectively, to the total molecular mass. The positive correlation between MAE365 and AAE in term of number concentration of CHNO implied that the CHNO species could greatly influence on the light absorption properties of the BB HULIS. The CHO and S-containing compounds (i.e., CHNOS and CHOS, that is CHNOS+CHOS) showed weak light absorbances of the BB HULIS. The BB HULIS from maize straw had relatively high molecular weight in comparison to that in other BB emissions. The highest and lowest aromaticity were seen on the wood burning and maize cob, respectively.
KW - Biomass burning
KW - HULIS
KW - Light absorption properties
KW - Molecular characterization
KW - PM
UR - https://www.scopus.com/pages/publications/85101613432
U2 - 10.1016/j.scitotenv.2021.146014
DO - 10.1016/j.scitotenv.2021.146014
M3 - 文章
C2 - 33652308
AN - SCOPUS:85101613432
SN - 0048-9697
VL - 776
JO - Science of the Total Environment
JF - Science of the Total Environment
M1 - 146014
ER -