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DOI | 10.5194/acp-17-12797-2017 |
Hygroscopic behavior and chemical composition evolution of internally mixed aerosols composed of oxalic acid and ammonium sulfate | |
Wang, Xiaowei1,2; Jing, Bo3; Tan, Fang3,4; Ma, Jiabi1; Zhang, Yunhong1; Ge, Maofa3,4,5 | |
2017-10-27 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS |
ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2017 |
卷号 | 17期号:20 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
英文摘要 | Although water uptake of aerosol particles plays an important role in the atmospheric environment, the effects of interactions between components on chemical composition and hygroscopicity of particles are still not well constrained. The hygroscopic properties and phase transformation of oxalic acid (OA) and mixed particles composed of ammonium sulfate (AS) and OA with different organic to inorganic molar ratios (OIRs) have been investigated by using confocal Raman spectroscopy. It is found that OA droplets first crystallize to form OA dihydrate at 71% relative humidity (RH), and further lose crystalline water to convert into anhydrous OA around 5% RH during the dehydration process. The deliquescence and efflorescence point for AS is determined to be 80.1 +/- 1.5% RH and 44.3 +/- 2.5% RH, respectively. The observed efflorescence relative humidity (ERH) for mixed OA / AS droplets with OIRs of 1 : 3, 1 : 1 and 3 : 1 is 34.4 +/- 2.0, 44.3 +/- 2.5 and 64.4 +/- 3.0% RH, respectively, indicating the elevated OA content appears to favor the crystallization of mixed systems at higher RH. However, the deliquescence relative humidity (DRH) of AS in mixed OA / AS particles with OIRs of 1 : 3 and 1 : 1 is observed to occur at 81.1 +/- 1.5 and 77 +/- 1.0% RH, respectively. The Raman spectra of mixed OA / AS droplets indicate the formation of ammonium hydrogen oxalate (NH4HC2O4) and ammonium hydrogen sulfate (NH4HSO4) from interactions between OA and AS in aerosols during the dehydration process on the time scale of hours, which considerably influence the subsequent deliquescence behavior of internally mixed particles with different OIRs. The mixed OA / AS particles with an OIR of 3 : 1 exhibit no deliquescence transition over the RH range studied due to the considerable transformation of. NH4/2SO4 into NH4HC2O4 with a high DRH. Although the hygroscopic growth of mixed OA / AS droplets is comparable to that of AS or OA at high RH during the dehydration process, Raman growth factors of mixed particles after deliquescence are substantially lower than those of mixed OA / AS droplets during the efflorescence process and further decrease with elevated OA content. The discrepancies for Raman growth factors of mixed OA / AS particles between the dehydration and hydration process at high RH can be attributed to the significant formation of NH4HC2O4 and residual OA, which remain solid at high RH and thus result in less water uptake of mixed particles. These findings improve the understanding of the role of reactions between dicarboxylic acid and inorganic salt in the chemical and physical properties of aerosol particles, and might have important implications for atmospheric chemistry. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000413853000001 |
WOS关键词 | DICARBOXYLIC-ACIDS ; WATER-UPTAKE ; ATMOSPHERIC AEROSOLS ; MALONIC-ACID ; PHASE-TRANSITIONS ; INORGANIC SALTS ; ORGANIC AEROSOL ; INFRARED-SPECTROSCOPY ; RAMAN-SPECTROSCOPY ; RELATIVE-HUMIDITY |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/16161 |
专题 | 地球科学 |
作者单位 | 1.Beijing Inst Technol, Inst Chem Phys, Sch Chem & Chem Engn, Beijing 100081, Peoples R China; 2.Henan Univ Sci & Technol, Sch Chem Engn & Pharmaceut, Luoyang 471023, Peoples R China; 3.Chinese Acad Sci, State Key Lab Struct Chem Unstable & Stable Speci, CAS Res Educ Ctr Excellence Mol Sci, BNLMS,Inst Chem, Beijing 100190, Peoples R China; 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China; 5.Chinese Acad Sci, Inst Urban Environm, Ctr Excellence Reg Atmospher Environm, Xiamen 361021, Peoples R China |
推荐引用方式 GB/T 7714 | Wang, Xiaowei,Jing, Bo,Tan, Fang,et al. Hygroscopic behavior and chemical composition evolution of internally mixed aerosols composed of oxalic acid and ammonium sulfate[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2017,17(20). |
APA | Wang, Xiaowei,Jing, Bo,Tan, Fang,Ma, Jiabi,Zhang, Yunhong,&Ge, Maofa.(2017).Hygroscopic behavior and chemical composition evolution of internally mixed aerosols composed of oxalic acid and ammonium sulfate.ATMOSPHERIC CHEMISTRY AND PHYSICS,17(20). |
MLA | Wang, Xiaowei,et al."Hygroscopic behavior and chemical composition evolution of internally mixed aerosols composed of oxalic acid and ammonium sulfate".ATMOSPHERIC CHEMISTRY AND PHYSICS 17.20(2017). |
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