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DOI | 10.5194/acp-13-5857-2013 |
Formation of aqueous-phase α-hydroxyhydroperoxides (α-HHP): potential atmospheric impacts | |
R. Zhao, A. K. Y. Lee, R. Soong, A. J. Simpson, and J. P. D. Abbatt | |
2013-06-17 | |
发表期刊 | Atmospheric Chemistry and Physics
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出版年 | 2013 |
英文摘要 | The focus of this work is on quantifying the degree of the aqueous-phase formation of α-hydroxyhydroperoxides (α-HHPs) via reversible nucleophilic addition of H2O2 to aldehydes. Formation of this class of highly oxygenated organic hydroperoxides represents a poorly characterized aqueous-phase processing pathway that may lead to enhanced SOA formation and aerosol toxicity. Specifically, the equilibrium constants of α-HHP formation have been determined using proton nuclear-magnetic-resonance (1H NMR) spectroscopy and proton-transfer-reaction mass spectrometry (PTR-MS). Significant α-HHP formation was observed from formaldehyde, acetaldehyde, propionaldehyde, glycolaldehyde, glyoxylic acid, and methylglyoxal, but not from methacrolein and ketones. Low temperatures enhanced the formation of α-HHPs but slowed their formation rates. High inorganic salt concentrations shifted the equilibria toward the hydrated form of the aldehydes and slightly suppressed α-HHP formation. Using the experimental equilibrium constants, we predict the equilibrium concentration of α-HHPs to be in the μM level in cloud water, but it may also be present in the mM level in aerosol liquid water (ALW), where the concentrations of H2O2 and aldehydes can be high. Formation of α-HHPs in ALW may significantly affect the effective Henry's law constants of H2O2 and aldehydes but may not affect their gas-phase levels. The photochemistry and reactivity of this class of atmospheric species have not been studied. |
领域 | 地球科学 |
URL | 查看原文 |
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/288040 |
专题 | 地球科学 |
推荐引用方式 GB/T 7714 | R. Zhao, A. K. Y. Lee, R. Soong, A. J. Simpson, and J. P. D. Abbatt. Formation of aqueous-phase α-hydroxyhydroperoxides (α-HHP): potential atmospheric impacts[J]. Atmospheric Chemistry and Physics,2013. |
APA | R. Zhao, A. K. Y. Lee, R. Soong, A. J. Simpson, and J. P. D. Abbatt.(2013).Formation of aqueous-phase α-hydroxyhydroperoxides (α-HHP): potential atmospheric impacts.Atmospheric Chemistry and Physics. |
MLA | R. Zhao, A. K. Y. Lee, R. Soong, A. J. Simpson, and J. P. D. Abbatt."Formation of aqueous-phase α-hydroxyhydroperoxides (α-HHP): potential atmospheric impacts".Atmospheric Chemistry and Physics (2013). |
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