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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 F.; Kang S.; Sillanpää M.; Hu Z.; Gao S.; Chen P.; Gautam S.; Reinikainen S.-P.; Li C.
发表日期	2020
ISSN	19961073
卷号	262
英文摘要	A new method is developed to overcome the particulate carbon detachment problem during the extraction of methanol-soluble BrC, and thus the reliable MAC is obtained. © 2020 Elsevier LtdAs 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. © 2020 Elsevier Ltd
英文关键词	Ambient aerosol; Biomass aerosol; MAC; Methanol-soluble brown carbon
语种	英语
scopus关键词	Environmental Pollution
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/158427
作者单位	Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, 100101, China; LUT School of Engineering Science, Lappeenranta University of Technology, P.O. Box 20, Lappeenranta, 53851, Finland; State Key Laboratory of Cryospheric Sciences, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China; CAS Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing, 100085, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Department of Civil and Environmental Engineering, Floride International University, Miami, FI, United States
推荐引用方式 GB/T 7714	Yan F.,Kang S.,Sillanpää M.,et al. A new method for extraction of methanol-soluble brown carbon: Implications for investigation of its light absorption ability[J]. 中国科学院西北生态环境资源研究院,2020,262.
APA	Yan F..,Kang S..,Sillanpää M..,Hu Z..,Gao S..,...&Li C..(2020).A new method for extraction of methanol-soluble brown carbon: Implications for investigation of its light absorption ability.,262.
MLA	Yan F.,et al."A new method for extraction of methanol-soluble brown carbon: Implications for investigation of its light absorption ability".262(2020).