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DOI	10.5194/acp-19-14195-2019
	Single-particle experiments measuring humidity and inorganic salt effects on gas-particle partitioning of butenedial
	Birdsall A.W.; Hensley J.C.; Kotowitz P.S.; Huisman A.J.; Keutsch F.N.
发表日期	2019
ISSN	16807316
起始页码	14195
结束页码	14209
卷号	19 期号:22
英文摘要	An improved understanding of the fate and properties of atmospheric aerosol particles requires a detailed process-level understanding of fundamental factors influencing the aerosol, including partitioning of aerosol components between the gas and particle phases. Laboratory experiments with levitated particles provide a way to study fundamental aerosol processes over timescales relevant to the multiday lifetime of atmospheric aerosol particles, in a controlled environment in which various characteristics relevant to atmospheric aerosol can be prepared (e.g., high surface-to-volume ratio, highly concentrated or supersaturated solutions, changes to relative humidity). In this study, the four-carbon unsaturated compound butenedial, a dialdehyde produced by oxidation of aromatic compounds that undergoes hydration in the presence of water, was used as a model organic aerosol component to investigate different factors affecting gas-particle partitioning, including the role of lower-volatility "reservoir" species such as hydrates, timescales involved in equilibration between higher- and lower-volatility forms, and the effect of inorganic salts. The experimental approach was to use a laboratory system coupling particle levitation in an electrodynamic balance (EDB) with particle composition measurement via mass spectrometry (MS). In particular, by fitting measured evaporation rates to a kinetic model, the effective vapor pressure was determined for butenedial and compared under different experimental conditions, including as a function of ambient relative humidity and the presence of high concentrations of inorganic salts. Even under dry (RH<5 %) conditions, the evaporation rate of butenedial is orders of magnitude lower than what would be expected if butenedial existed purely as a dialdehyde in the particle, implying an equilibrium strongly favoring hydrated forms and the strong preference of certain dialdehyde compounds to remain in a hydrated form even under lower water content conditions. Butenedial exhibits a salting-out effect in the presence of sodium chloride and sodium sulfate, in contrast to glyoxal. The outcomes of these experiments are also helpful in guiding the design of future EDB-MS experiments. © Author(s) 2019. This work is distributed under the Creative Commons Attribution 4.0 License.
语种	英语
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/144019
作者单位	Department of Chemistry and Chemical Biology, Harvard University, Cambridge, MA, United States; School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, United States; Chemistry Department, Union College, Schenectady, NY, United States; Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, United States; Nano Composix, San Diego, CA, United States; Gentex Corporation, Zeeland, MI, United States
推荐引用方式 GB/T 7714	Birdsall A.W.,Hensley J.C.,Kotowitz P.S.,et al. Single-particle experiments measuring humidity and inorganic salt effects on gas-particle partitioning of butenedial[J],2019,19(22).
APA	Birdsall A.W.,Hensley J.C.,Kotowitz P.S.,Huisman A.J.,&Keutsch F.N..(2019).Single-particle experiments measuring humidity and inorganic salt effects on gas-particle partitioning of butenedial.Atmospheric Chemistry and Physics,19(22).
MLA	Birdsall A.W.,et al."Single-particle experiments measuring humidity and inorganic salt effects on gas-particle partitioning of butenedial".Atmospheric Chemistry and Physics 19.22(2019).