Formation of aqueous-phase α-hydroxyhydroperoxides (α-HHP): potential atmospheric impacts

doi:10.5194/acp-13-5857-2013

GSTDTAP > 地球科学

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
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
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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).