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DOI	10.1016/j.atmosenv.2020.117848
	Hygroscopic properties and compositional evolution of internally mixed sodium nitrate-amino acid aerosols
	Guo Y.; Wang N.; Pang S.; Zhang Y.
发表日期	2020
ISSN	1352-2310
卷号	242
英文摘要	Although nitrates and amino acids are ubiquitous in the atmosphere, the interactions of amino acids with nitrates on the hygroscopicity of aerosols are still not clear. We studied the hygroscopic properties and compositional evolution of three atmospherically relevant species, sodium nitrate (NaNO3), glycine and L-alanine (alanine). The investigations on the NaNO3, glycine, alanine and their internally NaNO3/amino acid mixed particles with molar ratios of 3:1, 1:1 and 1:3 were conducted using attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR). The mixed NaNO3/glycine droplets with molar ratios of 3:1, 1:1 and 1:3 exhibited efflorescence transition at 52.3%, 62.6% and 63.2%RH, respectively. For the NaNO3/alanine mixed systems with molar ratios of 3:1, 1:1 and 1:3, the efflorescence relative humidity (ERH) was measured to be 50.2%, 59.8% and 69.3%, respectively. These results suggested that in each of the systems studied the addition of amino acids to aerosols could promote the crystallization of mixed droplets. However, the higher deliquescence relative humidity (DRH) with increased fraction of glycine for the mixed NaNO3/glycine (3:1, 79.2%RH; 1:1, 86.3%RH; 1:3, 86.5%RH) also indicated that glycine could inhibit the deliquescence phase transition of mixed systems. In the case of NaNO3/alanine systems, the DRH for 3:1 and 1:3 mixed particles was 78.2% and 82.7% while no deliquescence transition occurred for the 1:1 mixed particles. The hygroscopic properties of mixed NaNO3/amino acids droplets were modified due to the formed amino acid-NaNO3 complex salts from the interactions of amino acids with NaNO3 in aerosols during dehydration process. The discrepancies in water content for the mixed NaNO3/amino acids with molar ratios of 1:1 and 1:3 between dehydration and hydration processes at high RH could be attributed to the crystallization of amino acid-NaNO3 complex salts during dehydration and the residual amino acids. © 2020
关键词	Amino acid ATR-FTIR Hygroscopic properties NaNO3-Amino acid complex salts
语种	英语
scopus关键词	Aerosols; Amino acids; Dehydration; Drops; Drying; Efflorescence; Fourier transform infrared spectroscopy; Molar ratio; Nitrates; Salts; Surface chemistry; Attenuated total reflection Fourier transform infrared spectroscopy; Complex salts; Compositional evolution; Dehydration process; Hydration process; Hygroscopic properties; Mixed particles; Mixed systems; Sodium nitrate; alanine; amino acid; glycine; inorganic salt; nitrate; sodium chloride; sodium nitrate; aerosol composition; amino acid; crystallization; dehydration; hydration; hygroscopicity; molecular analysis; nitrate; phase transition; relative humidity; sodium; water content; absorption; Article; atmosphere; attenuated total reflexion Fourier transform infrared spectroscopy; chemical composition; crystallization; dehydration hydration reaction; Fourier transform infrared spectroscopy; humidity; hydration; phase transition; priority journal; water content; wettability
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/248934
作者单位	The Institute of Chemical Physics, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, 100081, China
推荐引用方式 GB/T 7714	Guo Y.,Wang N.,Pang S.,et al. Hygroscopic properties and compositional evolution of internally mixed sodium nitrate-amino acid aerosols[J],2020,242.
APA	Guo Y.,Wang N.,Pang S.,&Zhang Y..(2020).Hygroscopic properties and compositional evolution of internally mixed sodium nitrate-amino acid aerosols.ATMOSPHERIC ENVIRONMENT,242.
MLA	Guo Y.,et al."Hygroscopic properties and compositional evolution of internally mixed sodium nitrate-amino acid aerosols".ATMOSPHERIC ENVIRONMENT 242(2020).