气候变化领域集成服务门户(CCPortal): An investigation on hygroscopic properties of 15 black carbon (BC)-containing particles from different carbon sources: Roles of organic and inorganic components

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DOI	10.5194/acp-20-7941-2020
	An investigation on hygroscopic properties of 15 black carbon (BC)-containing particles from different carbon sources: Roles of organic and inorganic components
	Wang M.; Chen Y.; Fu H.; Qu X.; Li B.; Tao S.; Zhu D.
发表日期	2020
ISSN	16807316
起始页码	7941
结束页码	7954
卷号	20 期号:13
英文摘要	The hygroscopic behavior of black carbon (BC)-containing particles (BCPs) has a significant impact on global and regional climate change. However, the mechanism and factors controlling the hygroscopicity of BCPs from different carbon sources are not well understood. Here, we systematically measured the equilibrium and kinetics of water uptake by 15 different BCPs (10 herb-derived BCPs, 2 wood-derived BCPs, and 3 soot-type BCPs) using a gravimetric water vapor sorption method combined with in situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). In the gravimetric analysis, the sorption-desorption equilibrium isotherms were measured under continuous-stepwise water vapor pressure conditions, while the kinetics was measured at a variety of humidity levels obtained by different saturated aqueous salt solutions. The equilibrium water uptake of the tested group of BCPs at high relative humidity (80%) positively correlated to the dissolved mineral content (0.01-13.0 wt%) (0.86 P), the content of the thermogravimetrically analyzed organic carbon (OCTGA, 4.48-15.25%) (0.52 P), and the content of the alkali-extracted organic carbon (OC AE, 0.14-8.39%) (R0.80, 0.0001). In contrast, no positive correlation was obtained with the content of total organic carbon or elemental carbon. Among the major soluble ionic constituents, chloride and ammonium were each correlated with the equilibrium water uptake at high relative humidity. Compared with the herbal BCPs and soot, the woody BCPs had much lower equilibrium water uptake, especially at high relative humidity, likely due to the very low dissolved mineral content and OC content. The DRIFTS analysis provided generally consistent results at low relative humidity. The kinetics of water uptake (measured by pseudo-second-order rate constant) correlated to the content of OC AE as well as the content of chloride and ammonium at low relative humidity (33%) but to the porosity of BCPs at high relative humidity (94%). This was the first study to show that BCPs of different types and sources had greatly varying hygroscopic properties. . © Author(s) 2020.
关键词	black carbon hygroscopicity organic carbon reaction kinetics relative humidity sorption water uptake water vapor
语种	英语
来源机构	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/131942
推荐引用方式 GB/T 7714	Wang M.,Chen Y.,Fu H.,et al. An investigation on hygroscopic properties of 15 black carbon (BC)-containing particles from different carbon sources: Roles of organic and inorganic components[J]. Atmospheric Chemistry and Physics,2020,20(13).
APA	Wang M..,Chen Y..,Fu H..,Qu X..,Li B..,...&Zhu D..(2020).An investigation on hygroscopic properties of 15 black carbon (BC)-containing particles from different carbon sources: Roles of organic and inorganic components.,20(13).
MLA	Wang M.,et al."An investigation on hygroscopic properties of 15 black carbon (BC)-containing particles from different carbon sources: Roles of organic and inorganic components".20.13(2020).