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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, Rongshuang1; Lam, Hoi Ki1; Wilson, Kevin R.2; Davie, James F.3; Son, Mijung4; Li, Wentao5; Tse, Ying-Lung Steve5; Chan, Man Nin1,6 | |
2020-03-31 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS |
ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2020 |
卷号 | 20期号:6页码:3879-3893 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China; USA; South Korea |
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, gamma(eff), is found to decrease by about a factor of similar to 20 from 0.45 +/- 0.025 to 0.02 +/- 0.001 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 similar to 1.89 to similar to 250, our kinetic data would suggest that 2-methyltetrols in atmospheric particles are likely chemically stable against heterogeneous OH oxidation under humid conditions. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000522831200004 |
WOS关键词 | LIQUID PHASE-SEPARATION ; AIR-WATER-INTERFACE ; ISOPRENE-EPOXYDIOLS ; HO2 ELIMINATION ; GAS-PHASE ; METHANESULFONIC-ACID ; THERMODYNAMIC MODEL ; AEROSOL-PARTICLES ; AMMONIUM-SULFATE ; CITRIC-ACID |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/278722 |
专题 | 地球科学 |
作者单位 | 1.Chinese Univ Hong Kong, Fac Sci, Earth Syst Sci Programme, Hong Kong, Peoples R China; 2.Lawrence Berkeley Natl Lab, Chem Sci Div, Berkeley, CA USA; 3.Univ Calif Riverside, Dept Chem, Riverside, CA 92521 USA; 4.Jeonbuk Natl Univ, Dept Earth & Environm Sci, Jeonju, Jeollabuk Do, South Korea; 5.Chinese Univ Hong Kong, Dept Chem, Hong Kong, Peoples R China; 6.Chinese Univ Hong Kong, Inst Environm Energy & Sustainabil, Hong Kong, Peoples R China |
推荐引用方式 GB/T 7714 | Xu, Rongshuang,Lam, Hoi Ki,Wilson, Kevin 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[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2020,20(6):3879-3893. |
APA | Xu, Rongshuang.,Lam, Hoi Ki.,Wilson, Kevin R..,Davie, James F..,Son, Mijung.,...&Chan, Man Nin.(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),3879-3893. |
MLA | Xu, Rongshuang,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):3879-3893. |
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