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DOI	10.1016/j.atmosenv.2019.117101
	pH effect on the release of NH3 from the internally mixed sodium succinate and ammonium sulfate aerosols
	Du C.-Y.; Yang H.; Wang N.; Pang S.-F.; Zhang Y.-H.
发表日期	2020
ISSN	1352-2310
卷号	220
英文摘要	The pH value is an important parameter of atmospheric aerosol. It affects the concentration of conjugate acid-base pair through the acid-base equilibrium and thus determines the gas–particle partitioning of acids or bases with volatility. Our recent report shows that there is a substitution of weak base for strong base in the aerosols of internally mixed water-soluble organic acid salt/ammonium sulfate. However, the acidity effect on the substitution process still remains ambiguous. In this work, the aerosols generated from sodium succinate/ammonium sulfate solutions with different pHs were studied in detail by using ATR-FTIR technique. The effects of relative humidity (RH) and acidity (pH) on the composition evolution, hygroscopic property and phase change were monitored. At a constant RH for a given pH, there were continuous depletions of NH4+, COO− and water content accompanying occurrence of (CH2COOH)2 at initial stage, and then followed by Na2SO4 efflorescence, and at last participation of (CH2COOH)2. Lower RH was conductive to faster chemical composition evolution and resultant Na2SO4 crystallization. Higher pH promoted the composition evolution process and solid phase formation process. The consumptions of COO− and NH4+ increased with increasing pH, showing that the dissolution of NH4+ to release H+ in aerosols and NH3 to gas phase led to water loss, in turn, Na2SO4 and succinic acid efflorescence. Water loss was more sensitive to Na2SO4 efflorescence than succinic acid. When a RH cycle was experienced, Efflorescence RHs of sodium succinate/ammonium sulfate aerosols almost kept unchanged and deliquscence RHs increased obviously with pH, while no deliquescence for pH 7.62. To our knowledge, it is the first time to investigate the pH effect on chemical process about composition evolution. © 2019 Elsevier Ltd
关键词	Chemical process Hygroscopicity pH Physical phase RH
语种	英语
scopus关键词	Ammonia; Atmospheric aerosols; Atmospheric humidity; Drying; Efflorescence; pH; Rhodium; Sodium sulfate; Sulfur compounds; Surface chemistry; Ammonium sulfate aerosols; Chemical compositions; Chemical process; Composition evolution; Hygroscopic properties; Hygroscopicity; Physical phase; Water soluble organic acids; pH effects; ammonium sulfate; succinic acid; aerosol; ammonia; ammonium compound; ammonium sulfate; chemical method; hygroscopicity; pH; physical activity; sulfate; acid base balance; acidity; aerosol; Article; chemical composition; chemical reaction; conjugate; crystallization; Fourier transform infrared spectroscopy; humidity; pH; physical chemistry; priority journal; water content; water loss; 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/249503
作者单位	School of Chemistry and Chemical Engineering, Beijing Institute of TechnologyBeijing 100081, China
推荐引用方式 GB/T 7714	Du C.-Y.,Yang H.,Wang N.,et al. pH effect on the release of NH3 from the internally mixed sodium succinate and ammonium sulfate aerosols[J],2020,220.
APA	Du C.-Y.,Yang H.,Wang N.,Pang S.-F.,&Zhang Y.-H..(2020).pH effect on the release of NH3 from the internally mixed sodium succinate and ammonium sulfate aerosols.ATMOSPHERIC ENVIRONMENT,220.
MLA	Du C.-Y.,et al."pH effect on the release of NH3 from the internally mixed sodium succinate and ammonium sulfate aerosols".ATMOSPHERIC ENVIRONMENT 220(2020).