DOI: 10.1016/j.atmosenv.2019.117101
论文题名: pH effect on the release of NH3 from the internally mixed sodium succinate and ammonium sulfate aerosols
作者: Du C.-Y. ; Yang H. ; Wang N. ; Pang S.-F. ; Zhang Y.-H.
刊名: Atmospheric Environment
ISSN: 1352-2310
出版年: 2020
卷: 220 语种: 英语
英文关键词: 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
学科: Chemical process
; Hygroscopicity
; pH
; Physical phase
; RH
中文摘要: 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 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/160673
Appears in Collections: 气候变化与战略
There are no files associated with this item.
作者单位: School of Chemistry and Chemical Engineering, Beijing Institute of TechnologyBeijing 100081, China
Recommended Citation:
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]. Atmospheric Environment,2020-01-01,220