薪柴燃烧溶解性棕色碳排放特征及光学性质

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Abstract The study was aimed to investigate the emission characteristics and optical properties of primary brown carbon (BrC), including water-soluble organic matters (WSOM), water-soluble humic like substances (HULIS_WS), alkaline-soluble organic matters (ASOM), alkaline-soluble HULIS (HULIS_AS), emitted from household residential wood combustion. The results showed that residential wood combustion emitted large amounts of BrC. Among them, BrC_T (WSOM + ASOM) were observed to make up 46%~56% of total smoke PM_2.5 mass, and the emission factors of them were 7.5~16g/kg. HULIS were important light absorber in primary BrC, which accounted for 44%~46% of BrC_T. The SUVA₂₅₄, MAE₃₆₅ and AAE values for primary BrC were 1.9~4.0m²/g, 0.4~2.1m²/gand 6.2~11.1, respectively, indicating that the primary BrC emitted from wood combustion exhibited high aromaticity, strong light absorbing capacity and its light absorption presented strong wavelength dependence. 3DEEM results showed that the protein-like substances were dominant fluorophores for primary BrC fractions. It was significantly different from the fluorescent characteristics for WSOM in rainwater and atmospheric aerosols, in which the humic-like substances were predominant fluorophores. The correlation analysis revealed that MAE₃₆₅ present strong positive correlations with HIX and SUVA₂₅₄, while strong negative correlations were found with E₂/E₃, FI, BIX and β:α. It implied that the light absorption of primary BrC emitted from residential wood combustion were greatly related to their aromaticity, humification degree, autochthonous and freshness characteristics. The results obtained in this study are helpful to better understand the emission characteristics of BrC from BB, and also can provide such deep insight into the sources and environment effects of atmospheric BrC.

Key words： residential wood combustion brown carbon emission characteristics light absorption fluorescence spectral properties

Received: 28 January 2019

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X513

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	FAN Xing-jun
	CAO Tao
	YU Xu-fang
	SONG Jian-zhong
	WANG Yan
	XIAO Xin
	XIE Yue
	LI Fei-yue

Cite this article:

FAN Xing-jun,CAO Tao,YU Xu-fang等. Emission characteristics and optical properties of extractable brown carbon from residential wood combustion[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(8): 3215-3224.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I8/3215

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