重污染期间大气类腐殖质来源与光学特性研究

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Abstract The solid-phase extraction method and the thermal-optical method were combined to obtain different polar HULIS and the carbon content of HULIS (HULIS-C) in PM_2.5 with high temporal resolution during the heavy pollution event in Xi'an. The light absorption characteristics of HULIS were analyzed using a UV-Vis spectrophotometer equipped with a liquid waveguide capillary cell (LWCC), and the positive matrix factorization model (PMF) was used to analyze the sources of HULIS. At the same time, the source of HULIS is combined with the positive matrix factorization model (PMF). The results showed that the average mass concentration of neutral HULIS (HULIS-n) (6.6±2.6)μg/m³ was higher than that of acidic HULIS (HULIS-a) (3.7±3.5)μg/m³, accounting for approximately 30% and 18% of OC, respectively, indicating severe HULIS pollution during heavy pollution periods. The absorption coefficients (AAE, E₂/E₃, and MAE₃₆₅) of HULIS-n were all greater than those of HULIS-a, suggesting that HULIS-n contains more conjugated and aromatic structures and has stronger light-absorbing properties, with a more significant impact on atmospheric visibility. The source analysis revealed clear differences in the contributions of HULIS-n and HULIS-a. The primary sources of HULIS-n included secondary sources, coal combustion, motor vehicle emissions., while the contributions of secondary sources and coal combustion were higher for HULIS-a.

Key words： humic-like substances (HULIS) haze source apportionment pollution cause

Received: 24 September 2024

PACS:

X513

Corresponding Authors: 张倩,责任作者,副教授,zhangqian2018@xauat.edu.cn E-mail: zhangqian2018@xauat.edu.cn

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	LIU Jia-wen
	WANG Qi-yuan
	ZHANG Qian
	WANG Jin
	LI Chang-yan
	SUN Li

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LIU Jia-wen,WANG Qi-yuan,ZHANG Qian等. Research on the sources and optical properties of atmospheric humic-like substances during heavy pollution periods[J]. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(4): 1789-1798.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2025/V45/I4/1789

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