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DOI	10.5194/acp-20-3879-2020
	Effect of inorganic-to-organic mass ratio on the heterogeneous OH reaction rates of erythritol: Implications for atmospheric chemical stability of 2-methyltetrols
	Xu R.; Ki Lam H.; R Wilson K.; F Davies J.; Song M.; Li W.; Tse Y.-L.S.; Nin Chan M.
发表日期	2020
ISSN	1680-7316
起始页码	3879
结束页码	3893
卷号	20 期号:6
英文摘要	The 2-methyltetrols have been widely chosen as chemical tracers for isoprene-derived secondary organic aerosols. While they are often assumed to be relatively unreactive, a laboratory study reported that pure erythritol particles (an analog of 2-methyltetrols) can be heterogeneously oxidized by gas-phase OH radicals at a significant rate. This might question the efficacy of these compounds as tracers in aerosol source-apportionment studies. Additional uncertainty could arise as organic compounds and inorganic salts often coexist in atmospheric particles. To gain more insights into the chemical stability of 2-methyltetrols in atmospheric particles, this study investigates the heterogeneous OH oxidation of pure erythritol particles and particles containing erythritol and ammonium sulfate (AS) at different dry inorganic-to-organic mass ratios (IOR) in an aerosol flow tube reactor at a high relative humidity of 85 %. The same reaction products are formed upon heterogenous OH oxidation of erythritol and erythritol-AS particles, suggesting that the reaction pathways are not strongly affected by the presence and amount of AS. On the other hand, the effective OH uptake coefficient, eff, is found to decrease by about a factor of 20 from 0:450:025 to 0:020:001 when the relative abundance of AS increases and the IOR increases from 0.0 to 5.0. One likely explanation is the presence of dissolved ions slows down the reaction rates by decreasing the surface concentration of erythritol and reducing the frequency of collision between erythritol and gas-phase OH radicals at the particle surface. Hence, the heterogeneous OH reactivity of erythritol and likely 2-methyltetrols in atmospheric particles would be slower than previously thought when the salts are present. Given 2-methyltetrols often coexist with a significant amount of AS in many environments, where ambient IOR can vary from 1:89 to 250, our kinetic data would suggest that 2-methyltetrols in atmospheric particles are likely chemically stable against heterogeneous OH oxidation under humid conditions. © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License.
语种	英语
scopus关键词	aerosol; ammonium sulfate; atmospheric chemistry; hydroxide; inorganic matter; organic compound; oxidation; relative humidity; tracer; uncertainty analysis
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/141440
作者单位	Earth System Science Programme, Faculty of Science, Chinese University of Hong Kong, Hong Kong, Hong Kong; Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, United States; Department of Chemistry, University of California Riverside, Riverside, CA, United States; Department of Earth and Environmental Sciences, Jeonbuk National University, Jeonju, Jeollabuk-do, South Korea; Department of Chemistry, Chinese University of Hong Kong, Hong Kong, Hong Kong; Institute of Environment Energy and Sustainability, Chinese University of Hong Kong, Hong Kong, Hong Kong
推荐引用方式 GB/T 7714	Xu R.,Ki Lam H.,R Wilson K.,et al. Effect of inorganic-to-organic mass ratio on the heterogeneous OH reaction rates of erythritol: Implications for atmospheric chemical stability of 2-methyltetrols[J],2020,20(6).
APA	Xu R..,Ki Lam H..,R Wilson K..,F Davies J..,Song M..,...&Nin Chan M..(2020).Effect of inorganic-to-organic mass ratio on the heterogeneous OH reaction rates of erythritol: Implications for atmospheric chemical stability of 2-methyltetrols.Atmospheric Chemistry and Physics,20(6).
MLA	Xu R.,et al."Effect of inorganic-to-organic mass ratio on the heterogeneous OH reaction rates of erythritol: Implications for atmospheric chemical stability of 2-methyltetrols".Atmospheric Chemistry and Physics 20.6(2020).