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A platform for research: civil engineering, architecture and urbanism
Aqueous oxidation of green leaf volatiles by hydroxyl radical as a source of SOA: Kinetics and SOA yields
Abstract Green leaf volatiles (GLVs) are a class of oxygenated hydrocarbons released from vegetation, especially during mechanical stress or damage. The potential for GLVs to form secondary organic aerosol (SOA) via aqueous-phase reactions is not known. Fog events over vegetation will lead to the uptake of GLVs into water droplets, followed by aqueous-phase reactions with photooxidants such as the hydroxyl radical (OH). In order to determine if the aqueous oxidation of GLVs by OH can be a significant source of secondary organic aerosol, we studied the partitioning and reaction of five GLVs: cis-3-hexen-1-ol, cis-3-hexenyl acetate, methyl salicylate, methyl jasmonate, and 2-methyl-3-butene-2-ol. For each GLV we measured the kinetics of aqueous oxidation by OH, and the corresponding SOA mass yield. The second-order rate constants for GLVs with OH were all near diffusion controlled, (5.4–8.6) × 109 M−1 s−1 at 298 K, and showed a small temperature dependence, with an average activation energy of 9.3 kJ mol−1 Aqueous-phase SOA mass yields ranged from 10 to 88%, although some of the smaller values were not statistically different from zero. Methyl jasmonate was the most effective aqueous-phase SOA precursor due to its larger Henry's law constant and high SOA mass yield (68 ± 8%). While we calculate that the aqueous-phase SOA formation from the five GLVs is a minor source of aqueous-phase SOA, the availability of other GLVs, other oxidants, and interfacial reactions suggest that GLVs overall might be a significant source of SOA via aqueous reactions.
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Highlights We assessed the potential contribution of aqueous GLV reactions as a source of SOA. Second-order rate constants for GLVs with OH ranged from (5.4–8.6) × 109 M−1 s−1. Aqueous-phase SOA mass yields ranged from 10 to 88%. Calculations show that SOA formation from these GLVs is a minor contributor to SOA.
Aqueous oxidation of green leaf volatiles by hydroxyl radical as a source of SOA: Kinetics and SOA yields
Abstract Green leaf volatiles (GLVs) are a class of oxygenated hydrocarbons released from vegetation, especially during mechanical stress or damage. The potential for GLVs to form secondary organic aerosol (SOA) via aqueous-phase reactions is not known. Fog events over vegetation will lead to the uptake of GLVs into water droplets, followed by aqueous-phase reactions with photooxidants such as the hydroxyl radical (OH). In order to determine if the aqueous oxidation of GLVs by OH can be a significant source of secondary organic aerosol, we studied the partitioning and reaction of five GLVs: cis-3-hexen-1-ol, cis-3-hexenyl acetate, methyl salicylate, methyl jasmonate, and 2-methyl-3-butene-2-ol. For each GLV we measured the kinetics of aqueous oxidation by OH, and the corresponding SOA mass yield. The second-order rate constants for GLVs with OH were all near diffusion controlled, (5.4–8.6) × 109 M−1 s−1 at 298 K, and showed a small temperature dependence, with an average activation energy of 9.3 kJ mol−1 Aqueous-phase SOA mass yields ranged from 10 to 88%, although some of the smaller values were not statistically different from zero. Methyl jasmonate was the most effective aqueous-phase SOA precursor due to its larger Henry's law constant and high SOA mass yield (68 ± 8%). While we calculate that the aqueous-phase SOA formation from the five GLVs is a minor source of aqueous-phase SOA, the availability of other GLVs, other oxidants, and interfacial reactions suggest that GLVs overall might be a significant source of SOA via aqueous reactions.
Graphical abstract Display Omitted
Highlights We assessed the potential contribution of aqueous GLV reactions as a source of SOA. Second-order rate constants for GLVs with OH ranged from (5.4–8.6) × 109 M−1 s−1. Aqueous-phase SOA mass yields ranged from 10 to 88%. Calculations show that SOA formation from these GLVs is a minor contributor to SOA.
Aqueous oxidation of green leaf volatiles by hydroxyl radical as a source of SOA: Kinetics and SOA yields
Richards-Henderson, Nicole K. (author) / Hansel, Amie K. (author) / Valsaraj, Kalliat T. (author) / Anastasio, Cort (author)
Atmospheric Environment ; 95 ; 105-112
2014-06-12
8 pages
Article (Journal)
Electronic Resource
English
Hydroxyl radical yields from reactions of terpene mixtures with ozone
| Online Contents | 2011