生物质燃烧排放PM<sub>2.5</sub>颗粒萃取的水溶性有机碳液相光化学氧化

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Abstract To explore aqueous-phase oxidation characteristics of extracted water soluble organic carbon (WSOC) in PM_2.5 emitted from biomass burning, this study investigated the absorption, fluorescence and the oxidation properties of WSOC from two types of biomass burning (wheat and rice straws) under ultraviolet (UV) and UV+H₂O₂ (UV+OH) conditions. The results from total organic carbon (TOC) analyzer showed that WSOC removal rates were almost the same in the two conditions. Extra H₂O₂ adding didn't improve the removal rates of WSOC, indicating direct photolysis was the major degradation pathway of WSOC. The removal rates of WSOC for wheat straw in two types of biomass burning samples were relatively fast, reducing about 70% in 17hours. No significant differences were found in aqueous-phase photochemical oxidation products between rice straw and wheat straw burning samples. With the photolysis process, absorbance decreased gradually due to WSOC degradation, and fluorescence intensity at excitation/emission (Ex/Em)255~260nm/330~340nm also declined. However, new fluorescent peaks at Ex/Em=230/(400~500) nm appeared, which could might be ascribed to the formation of humic-like substance (HULIS). Besides, high-resolution aerosol mass spectra (HR-AMS) was used to investigate aqSOA formation potential and its oxidation characteristics. The results showed that the mass of aqSOA decreased while aqSOA became more oxidative owing to the content of O-containing functional groups increasing as aging. The variation of oxidative potential (OPs) was similar to that of HULIS, with rose at first and then declined in UV+OH condition, which could be attributed to the formation of O-containing functional groups at first stage and subsequent degradation. Based on the above analysis results, we infer that the process of aqueous-phase oxidation of WSOC undergo functionalization to form the first generation products, then to more oxidized second-and third-generation smaller species formed by fragmentation and ring-opening reactions, which in turn indirectly impact climate change and air quality. The study revealed the aging behaviors of WSOC emitted from biomass burning, providing insights into understanding the light absorption, SOA formation and health effects caused by aqueous-phase oxidation reaction.

Key words： biomass burning WSOC aqueous-phase oxidation fluorescence characteristics oxidative potential

Received: 28 July 2022

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X513

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	Articles by authors
	ZHU Long-wei
	CUI Yao-jia
	GE Xin-lei
	YE Zhao-lian
	ZHAO Zhu-zi

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ZHU Long-wei,CUI Yao-jia,GE Xin-lei等. Aqueous-phase photochemical oxidation of extracted WSOC in PM_2.5 from biomass burning[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(3): 1014-1025.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I3/1014

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