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DOI	10.1016/j.envpol.2020.114300
	A new method for extraction of methanol-soluble brown carbon: Implications for investigation of its light absorption ability
	Yan, Fangping; Kang, Shichang; Sillanpaa, Mika; Hu, Zhaofu; Gao, Shaopeng; Chen, Pengfei; Gautam, Sangita; Reinikainen, Satu-Pia; Li, Chaoliu
通讯作者	Li, CL (通讯作者)
发表日期	2020
ISSN	0269-7491
EISSN	1873-6424
卷号	262
英文摘要	As an important component of organic carbon (OC), brown carbon (BrC) plays a significant role in radiative forcing in the atmosphere. Water-insoluble OC (WIOC) generally has higher light absorption ability than water-soluble OC (WSOC). The mass absorption cross-section (MAC) of WIOC is normally investigated by dissolving OC in methanol. However, all the current methods have shortcomings due to neglecting the methanol insoluble particulate carbon that is detached from the filter and suspended in methanol extracts, which results in MAC uncertainties of the methanol-soluble BrC and its climate warming estimation. In this study, by investigating typical biomass combustion sourced aerosols from the Tibetan Plateau and ambient aerosols from rural and urban areas in China, we evaluated the light absorption of extractable OC fraction for the existing methods. Moreover, a new method was developed to overcome the methanol insoluble particulate carbon detachment problem to achieve more reliable MAC values. We found that OC can be dissolved in methanol in a short time (e.g., 1 h) and ultrasonic treatment and long-term soaking do not significantly increase the extractable OC fraction. Additionally, we proved that methanol insoluble particulate carbon detachment in methanol does exist in previous methods, causing overestimation of the BrC mass extracted by methanol and thus the underestimation of MAC values. We therefore recommend the newly developed extraction method in this study to be utilized in future related studies to quantitatively obtain the light absorption property of methanol-soluble BrC. (C) 2020 Elsevier Ltd. All rights reserved.
关键词	TIBETAN PLATEAU ORGANIC-CARBON BLACK CARBON AEROSOLS BIOMASS COMBUSTION ATMOSPHERE POLLUTION PROGRESS PM2.5
英文关键词	Methanol-soluble brown carbon; MAC; Biomass aerosol; Ambient aerosol
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:000533524300045
来源期刊	ENVIRONMENTAL POLLUTION
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259887
推荐引用方式 GB/T 7714	Yan, Fangping,Kang, Shichang,Sillanpaa, Mika,et al. A new method for extraction of methanol-soluble brown carbon: Implications for investigation of its light absorption ability[J]. 中国科学院青藏高原研究所,2020,262.
APA	Yan, Fangping.,Kang, Shichang.,Sillanpaa, Mika.,Hu, Zhaofu.,Gao, Shaopeng.,...&Li, Chaoliu.(2020).A new method for extraction of methanol-soluble brown carbon: Implications for investigation of its light absorption ability.ENVIRONMENTAL POLLUTION,262.
MLA	Yan, Fangping,et al."A new method for extraction of methanol-soluble brown carbon: Implications for investigation of its light absorption ability".ENVIRONMENTAL POLLUTION 262(2020).