Emission characteristics and optical properties of extractable brown carbon from residential wood combustion
FAN Xing-jun1, CAO Tao2,3, YU Xu-fang1, SONG Jian-zhong2, WANG Yan1, XIAO Xin1, XIE Yue1, LI Fei-yue1
1. College of Resources and Environment, Anhui Science and Technology University, Fengyang 233100, China; 2. State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China; 3. University of Chinese Academy of Sciences, Beijing 100049, China
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 (HULISWS), alkaline-soluble organic matters (ASOM), alkaline-soluble HULIS (HULISAS), emitted from household residential wood combustion. The results showed that residential wood combustion emitted large amounts of BrC. Among them, BrCT (WSOM + ASOM) were observed to make up 46%~56% of total smoke PM2.5 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 BrCT. 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.
范行军, 操涛, 余旭芳, 宋建中, 王艳, 肖新, 谢越, 李飞跃. 薪柴燃烧溶解性棕色碳排放特征及光学性质[J]. 中国环境科学, 2019, 39(8): 3215-3224.
FAN Xing-jun, CAO Tao, YU Xu-fang, SONG Jian-zhong, WANG Yan, XIAO Xin, XIE Yue, LI Fei-yue. Emission characteristics and optical properties of extractable brown carbon from residential wood combustion. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(8): 3215-3224.
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