气候变化领域集成服务门户(CCPortal): Measurement report: Abundance and fractional solubilities of aerosol metals in urban Hong Kong - insights into factors that control aerosol metaldissolution in an urban site in South China

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DOI	10.5194/acp-23-1403-2023
	Measurement report: Abundance and fractional solubilities of aerosol metals in urban Hong Kong - insights into factors that control aerosol metaldissolution in an urban site in South China
	Yang, Junwei; Ma, Lan; He, Xiao; Au, Wing Chi; Miao, Yanhao; Wang, Wen-Xiong; Nah, Theodora
发表日期	2023
ISSN	1680-7316
EISSN	1680-7324
起始页码	1403
结束页码	1419
卷号	23 期号:2 页码:17
英文摘要	Water-soluble metals are known to produce greater adverse human healthoutcomes than their water-insoluble forms. Although the concentrations ofwater-soluble aerosol metals are usually limited by atmospheric processesthat convert water-insoluble metals to water-soluble forms, factors thatcontrol the solubilities of aerosol metals in different environments remainpoorly understood. In this study, we investigated the abundance and fractional solubilities of different metals in size-fractionated aerosolscollected at an urban site in Hong Kong and identified the factors thatmodulated metal solubilities in fine aerosols. The concentrations of totaland water-soluble metals in fine and coarse aerosols were the highest during the winter and spring seasons due to the long-range transport of air masses by northerly prevailing winds from emission sources located in continental areas north of Hong Kong. The study-averaged metal fractional solubilities spanned a wide range for both fine (7.8 % to 71.2 %) and coarse (0.4 % to 47.9 %) aerosols, but higher fractional solubilities were typically observed for fine aerosols. Sulfate was found to be stronglyassociated with both the concentrations of water-soluble Cr, Fe, Co, Cu, Pb, and Mn and their fractional solubilities in fine aerosols, which implied that sulfate-driven acid processing likely played an important role in the dissolution of the water-insoluble forms for these six metals. Further analyses revealed that these strong associations were due to sulfate providing both the acidic environment and liquid water reaction medium needed for the acid dissolution process. Thus, the variability in the concentrations of water-soluble Cr, Fe, Co, Cu, Pb, and Mn and theirfractional solubilities were driven by both the aerosol acidity levels andliquid water concentrations, which in turn were controlled by sulfate. These results highlight the roles that sulfate plays in the acid dissolution of metals in fine aerosols in Hong Kong. Our findings will likely also apply to other urban areas in South China, where sulfate is the dominant acidic and hygroscopic component in fine aerosols.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000920239200001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273567
作者单位	City University of Hong Kong; City University of Hong Kong; Shenzhen University
推荐引用方式 GB/T 7714	Yang, Junwei,Ma, Lan,He, Xiao,et al. Measurement report: Abundance and fractional solubilities of aerosol metals in urban Hong Kong - insights into factors that control aerosol metaldissolution in an urban site in South China[J],2023,23(2):17.
APA	Yang, Junwei.,Ma, Lan.,He, Xiao.,Au, Wing Chi.,Miao, Yanhao.,...&Nah, Theodora.(2023).Measurement report: Abundance and fractional solubilities of aerosol metals in urban Hong Kong - insights into factors that control aerosol metaldissolution in an urban site in South China.ATMOSPHERIC CHEMISTRY AND PHYSICS,23(2),17.
MLA	Yang, Junwei,et al."Measurement report: Abundance and fractional solubilities of aerosol metals in urban Hong Kong - insights into factors that control aerosol metaldissolution in an urban site in South China".ATMOSPHERIC CHEMISTRY AND PHYSICS 23.2(2023):17.