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Sarang K, Otto T, Gagan S, Rudzinski K, Schaefer T, Brüggemann M, Grgić I, Kubas A, Herrmann H, Szmigielski R. Aqueous-phase photo-oxidation of selected green leaf volatiles initiated by OH radicals: Products and atmospheric implications. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 879:162622. [PMID: 36878296 DOI: 10.1016/j.scitotenv.2023.162622] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 02/27/2023] [Accepted: 02/28/2023] [Indexed: 05/17/2023]
Abstract
C5- and C6- unsaturated oxygenated organic compounds emitted by plants under stress like cutting, freezing or drying, known as Green Leaf Volatiles (GLVs), may clear some of the existing uncertainties in secondary organic aerosol (SOA) budget. The transformations of GLVs are a potential source of SOA components through photo-oxidation processes occurring in the atmospheric aqueous phase. Here, we investigated the aqueous photo-oxidation products from three abundant GLVs (1-penten-3-ol, (Z)-2-hexen-1-ol, and (E)-2-hexen-1-al) induced by OH radicals, carried out in a photo-reactor under simulated solar conditions. The aqueous reaction samples were analyzed using advanced hyphenated mass spectrometry techniques: capillary gas chromatography mass spectrometry (c-GC-MS); and reversed-phase liquid chromatography high resolution mass spectrometry (LC-HRMS). Using carbonyl-targeted c-GC-MS analysis, we confirmed the presence of propionaldehyde, butyraldehyde, 1-penten-3-one, and 2-hexen-1-al in the reaction samples. The LC-HRMS analysis confirmed the presence of a new carbonyl product with the molecular formula C6H10O2, which probably bears the hydroxyhexenal or hydroxyhexenone structure. Density functional theory (DFT)-based quantum calculations were used to evaluate the experimental data and obtain insight into the formation mechanism and structures of the identified oxidation products via the addition and hydrogen-abstraction pathways. DFT calculations highlighted the importance of the hydrogen abstraction pathway leading to the new product C6H10O2. Atmospheric relevance of the identified products was evaluated using a set of physical property data like Henry's law constant (HLC) and vapor pressure (VP). The unknown product of molecular formula C6H10O2 has higher HLC and lower VP than the parent GLV and thus has potential to remain in the aqueous phase leading to possible aqueous SOA formation. Other observed carbonyl products are likely first stage oxidation products and precursors of aged SOA.
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Affiliation(s)
- Kumar Sarang
- Institute of Physical Chemistry Polish Academy of Sciences, 01-224 Warsaw, Poland
| | - Tobias Otto
- Atmospheric Chemistry Department (ACD), Leibniz Institute for Tropospheric Research (TROPOS), 04318 Leipzig, Germany
| | - Sahir Gagan
- Institute of Physical Chemistry Polish Academy of Sciences, 01-224 Warsaw, Poland
| | - Krzysztof Rudzinski
- Institute of Physical Chemistry Polish Academy of Sciences, 01-224 Warsaw, Poland
| | - Thomas Schaefer
- Atmospheric Chemistry Department (ACD), Leibniz Institute for Tropospheric Research (TROPOS), 04318 Leipzig, Germany
| | - Martin Brüggemann
- Atmospheric Chemistry Department (ACD), Leibniz Institute for Tropospheric Research (TROPOS), 04318 Leipzig, Germany
| | - Irena Grgić
- Department of Analytical Chemistry, National Institute of Chemistry, SI-1000 Ljubljana, Slovenia
| | - Adam Kubas
- Institute of Physical Chemistry Polish Academy of Sciences, 01-224 Warsaw, Poland.
| | - Hartmut Herrmann
- Atmospheric Chemistry Department (ACD), Leibniz Institute for Tropospheric Research (TROPOS), 04318 Leipzig, Germany.
| | - Rafal Szmigielski
- Institute of Physical Chemistry Polish Academy of Sciences, 01-224 Warsaw, Poland.
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2
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Experimental and Theoretical Studies of Trans-2-Pentenal Atmospheric Ozonolysis. ATMOSPHERE 2022. [DOI: 10.3390/atmos13020291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
We investigated the kinetics, mechanism and secondary organic aerosols formation of the ozonolysis of trans-2-pentenal (T2P) using four different reactors with Fourier Transform InfraRed (FTIR) spectroscopy and Gas Chromatography (GC) techniques at T = 298 ± 2 K and 760 Torr in dry conditions. The rate coefficients and branching ratios were also evaluated using the canonical variational transition (CVT) state theory coupled with small curvature tunneling (CVT/SCT) in the range 278–350 K. The experimental rate coefficient at 298 K was (1.46 ± 0.17) × 10−18 cm3 molecule−1 s−1, in good agreement with the theoretical rate. The two primary carbonyls formation yields, glyoxal and propanal, were 57 ± 10% and 42 ± 12%, respectively, with OH scavenger compared to 38 ± 8% for glyoxal and 26 ± 5% for propanal without OH scavenger. Acetaldehyde and 2-hydroxypropanal were also identified and quantified with yields of 9 ± 3% and 5 ± 2%, respectively, in the presence of OH scavenger. For the OH production, an upper limit of 24% was estimated using mesitylene as OH tracer. Combining experimental and theoretical findings enabled the establishment of a chemical mechanism. Finally, the SOA formation was observed with mass yields of about 1.5%. This work provides additional information on the effect of the aldehyde functional group on the fragmentation of the primary ozonide.
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Sarang K, Otto T, Rudzinski K, Schaefer T, Grgić I, Nestorowicz K, Herrmann H, Szmigielski R. Reaction Kinetics of Green Leaf Volatiles with Sulfate, Hydroxyl, and Nitrate Radicals in Tropospheric Aqueous Phase. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:13666-13676. [PMID: 34583512 PMCID: PMC8529707 DOI: 10.1021/acs.est.1c03276] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Revised: 09/13/2021] [Accepted: 09/14/2021] [Indexed: 05/28/2023]
Abstract
Green plants exposed to abiotic or biotic stress release C-5 and C-6 unsaturated oxygenated hydrocarbons called Green Leaf Volatiles (GLVs). GLVs partition into tropospheric waters and react to form secondary organic aerosol (SOA). We explored the kinetics of aqueous-phase reactions of 1-penten-3-ol (PENTOL), (Z)-2-hexen-1-ol (HEXOL), and (E)-2-hexen-1-al (HEXAL) with SO4•-, •OH, and NO3•. At 298 K, the rate constants for reactions of PENTOL, HEXOL, and HEXAL with SO4•- were, respectively, (9.4 ± 1.0) × 108 L mol-1 s-1, (2.5 ± 0.3) × 109 L mol-1 s-1, and (4.8 ± 0.2) × 108 L mol-1 s-1; with •OH - (6.3 ± 0.1) × 109 L mol-1 s-1, (6.7 ± 0.3) × 109 L mol-1 s-1, and (4.8 ± 0.3) × 109 L mol-1 s-1; and with NO3• - (1.5 ± 0.15) × 108 L mol-1 s-1, (8.4 ± 2.3) × 108 L mol-1 s-1, and (3.0 ± 0.7) × 107 L mol-1 s-1. The rate constants increased weakly with temperatures ranging from 278 to 318 K. The diffusional limitations of the rate constants appeared significant only for the GLV-•OH reactions. The aqueous-phase reactions appeared negligible in deliquescent aerosol and haze water but not in clouds and rains. The atmospheric lifetimes of GLVs decreased from many days to hours with increasing liquid water content and radicals' concentration.
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Affiliation(s)
- Kumar Sarang
- Environmental
Chemistry Group, Institute of Physical Chemistry
Polish Academy of Sciences, 01-224 Warsaw, Poland
| | - Tobias Otto
- Atmospheric
Chemistry Department, Leibniz Institute
for Tropospheric Research, 04318, Leipzig, Germany
| | - Krzysztof Rudzinski
- Environmental
Chemistry Group, Institute of Physical Chemistry
Polish Academy of Sciences, 01-224 Warsaw, Poland
| | - Thomas Schaefer
- Atmospheric
Chemistry Department, Leibniz Institute
for Tropospheric Research, 04318, Leipzig, Germany
| | - Irena Grgić
- Department
of Analytical Chemistry, National Institute
of Chemistry, SI-1000, Ljubljana, Slovenia
| | - Klara Nestorowicz
- Environmental
Chemistry Group, Institute of Physical Chemistry
Polish Academy of Sciences, 01-224 Warsaw, Poland
| | - Hartmut Herrmann
- Atmospheric
Chemistry Department, Leibniz Institute
for Tropospheric Research, 04318, Leipzig, Germany
| | - Rafal Szmigielski
- Environmental
Chemistry Group, Institute of Physical Chemistry
Polish Academy of Sciences, 01-224 Warsaw, Poland
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4
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Kalalian C, Samir B, Roth E, Chakir A. UV absorption spectra of trans-2-pentenal, trans-2-hexenal and 2-methyl-2-pentenal. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2019.01.028] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Newland MJ, Rea GJ, Thüner LP, Henderson AP, Golding BT, Rickard AR, Barnes I, Wenger J. Photochemistry of 2-butenedial and 4-oxo-2-pentenal under atmospheric boundary layer conditions. Phys Chem Chem Phys 2019; 21:1160-1171. [DOI: 10.1039/c8cp06437g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The photochemical mechanism of unsaturated 1,4-dicarbonyls proceeds predominantlyviaa ketene–enol which isomerises to a furanone.
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Affiliation(s)
- Mike J. Newland
- Wolfson Atmospheric Chemistry Laboratories
- Department of Chemistry
- University of York
- UK
| | - Gerard J. Rea
- School of Chemistry and Environmental Research Institute
- University College Cork
- Cork
- Ireland
| | - Lars P. Thüner
- School of Chemistry and Environmental Research Institute
- University College Cork
- Cork
- Ireland
| | - Alistair P. Henderson
- School of Natural and Environmental Sciences
- Bedson Building
- Newcastle University
- Newcastle upon Tyne
- UK
| | - Bernard T. Golding
- School of Natural and Environmental Sciences
- Bedson Building
- Newcastle University
- Newcastle upon Tyne
- UK
| | - Andrew R. Rickard
- Wolfson Atmospheric Chemistry Laboratories
- Department of Chemistry
- University of York
- UK
- National Centre for Atmospheric Science
| | - Ian Barnes
- University of Wuppertal
- School of Mathematics and Natural Science
- Institute of Atmospheric and Environmental Research
- Wuppertal
- Germany
| | - John Wenger
- School of Chemistry and Environmental Research Institute
- University College Cork
- Cork
- Ireland
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Mellouki A, Wallington TJ, Chen J. Atmospheric chemistry of oxygenated volatile organic compounds: impacts on air quality and climate. Chem Rev 2015; 115:3984-4014. [PMID: 25828273 DOI: 10.1021/cr500549n] [Citation(s) in RCA: 211] [Impact Index Per Article: 23.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- A Mellouki
- Environment Research Institute, School of Environmental Science and Engineering, Shandong University, Ji'nan 250100, China.,ICARE/OSUC, CNRS, 45071 Orléans, France.,Systems Analytics and Environmental Sciences Department, Ford Motor Company, Mail Drop RIC-2122, Dearborn, Michigan 48121-2053, United States.,Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Fudan Tyndall Centre, Shanghai 200433, China.,Environment Research Institute, School of Environmental Science and Engineering, Shandong University, Ji'nan 250100, China
| | - T J Wallington
- Environment Research Institute, School of Environmental Science and Engineering, Shandong University, Ji'nan 250100, China.,ICARE/OSUC, CNRS, 45071 Orléans, France.,Systems Analytics and Environmental Sciences Department, Ford Motor Company, Mail Drop RIC-2122, Dearborn, Michigan 48121-2053, United States.,Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Fudan Tyndall Centre, Shanghai 200433, China.,Environment Research Institute, School of Environmental Science and Engineering, Shandong University, Ji'nan 250100, China
| | - J Chen
- Environment Research Institute, School of Environmental Science and Engineering, Shandong University, Ji'nan 250100, China.,ICARE/OSUC, CNRS, 45071 Orléans, France.,Systems Analytics and Environmental Sciences Department, Ford Motor Company, Mail Drop RIC-2122, Dearborn, Michigan 48121-2053, United States.,Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Fudan Tyndall Centre, Shanghai 200433, China.,Environment Research Institute, School of Environmental Science and Engineering, Shandong University, Ji'nan 250100, China
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Shalamzari MS, Kahnt A, Vermeylen R, Kleindienst TE, Lewandowski M, Cuyckens F, Maenhaut W, Claeys M. Characterization of polar organosulfates in secondary organic aerosol from the green leaf volatile 3-Z-hexenal. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2014; 48:12671-8. [PMID: 25271849 DOI: 10.1021/es503226b] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Evidence is provided that the green leaf volatile 3-Z-hexenal serves as a precursor for biogenic secondary organic aerosol through the formation of polar organosulfates (OSs) with molecular weight (MW) 226. The MW 226 C6-OSs were chemically elucidated, along with structurally similar MW 212 C5-OSs, whose biogenic precursor is likely related to 3-Z-hexenal but still remains unknown. The MW 226 and 212 OSs have a substantial abundance in ambient fine aerosol from K-puszta, Hungary, which is comparable to that of the isoprene-related MW 216 OSs, known to be formed through sulfation of C5-epoxydiols, second-generation gas-phase photooxidation products of isoprene. Using detailed interpretation of negative-ion electrospray ionization mass spectral data, the MW 226 compounds are assigned to isomeric sulfate esters of 3,4-dihydroxyhex-5-enoic acid with the sulfate group located at the C-3 or C-4 position. Two MW 212 compounds present in ambient fine aerosol are attributed to isomeric sulfate esters of 2,3-dihydroxypent-4-enoic acid, of which two are sulfated at C-3 and one is sulfated at C-2. The formation of the MW 226 OSs is tentatively explained through photooxidation of 3-Z-hexenal in the gas phase, resulting in an alkoxy radical, followed by a rearrangement and subsequent sulfation of the epoxy group in the particle phase.
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Muñoz A, Vera T, Ródenas M, Borrás E, Mellouki A, Treacy J, Sidebottom H. Gas-phase degradation of the herbicide ethalfluralin under atmospheric conditions. CHEMOSPHERE 2014; 95:395-401. [PMID: 24139158 DOI: 10.1016/j.chemosphere.2013.09.053] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2013] [Revised: 09/06/2013] [Accepted: 09/16/2013] [Indexed: 06/02/2023]
Abstract
The gas-phase degradation of ethalfluralin, N-ethyl-α,α,α-trifluoro-N-(2-methylallyl)-2,6-dinitro-p-toluidine, a widely used herbicide, was investigated under atmospheric conditions at the large outdoor European simulation chamber (EUPHORE) in Valencia, Spain. The photolysis of ethalfluralin was investigated under solar radiation and the mean photolysis rate coefficient was determined: J(ethalfluralin)=(1.3±0.2)×10(-3) s(-1) (JNO2=8×10(-3) s(-1)). The rate coefficients for the reactions of hydroxyl radicals and ozone with ethalfluralin in the dark were also measured under atmospheric conditions using the relative rate and the absolute rate technique, respectively. The rate coefficients values for the reactions of kOH(ethalfluralin)=(3.5±0.9)×10(-11)cm(3)molecule(-1)s(-1), and kO3(ethalfluralin)=(1.6±0.4)×10(-17) cm(3) molecule(-1) s(-1) were determined at 300±5 K and atmospheric pressure. The results show that removal of ethalfluralin from the atmosphere by reactions with OH radicals (τ ~ 4 h) or ozone (τ ~ 25 h) is slow compared to loss by photolysis. The available kinetic data suggest that the gas-phase tropospheric degradation of ethalfluralin will be controlled mainly by photolysis and provide an estimate for the tropospheric lifetime of approximately 12 min. The atmospheric implications of using ethalfluralin as a herbicide are discussed.
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Affiliation(s)
- Amalia Muñoz
- Instituto Universitario UMH-CEAM, C/Charles R. Darwin, 14, Parque Tecnológico, 46980 Paterna, Valencia, Spain.
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9
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Xing JH, Ono M, Kuroda A, Obi K, Sato K, Imamura T. Kinetic Study of the Daytime Atmospheric Fate of (Z)-3-Hexenal. J Phys Chem A 2012; 116:8523-9. [DOI: 10.1021/jp303202h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jia-Hua Xing
- National Institute for Environment Studies, Tsukuba, Ibaraki 305-8506, Japan
| | - Miyuki Ono
- National Institute for Environment Studies, Tsukuba, Ibaraki 305-8506, Japan
- Department of Chemical and Biological Sciences, Japan Women’s University, Bunkyo-ku, Tokyo 112-8681,
Japan
| | - Ayako Kuroda
- National Institute for Environment Studies, Tsukuba, Ibaraki 305-8506, Japan
- Department of Chemical and Biological Sciences, Japan Women’s University, Bunkyo-ku, Tokyo 112-8681,
Japan
| | - Kinichi Obi
- National Institute for Environment Studies, Tsukuba, Ibaraki 305-8506, Japan
- Department of Chemical and Biological Sciences, Japan Women’s University, Bunkyo-ku, Tokyo 112-8681,
Japan
| | - Kei Sato
- National Institute for Environment Studies, Tsukuba, Ibaraki 305-8506, Japan
| | - Takashi Imamura
- National Institute for Environment Studies, Tsukuba, Ibaraki 305-8506, Japan
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10
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Wolfe GM, Crounse JD, Parrish JD, St. Clair JM, Beaver MR, Paulot F, Yoon TP, Wennberg PO, Keutsch FN. Photolysis, OH reactivity and ozone reactivity of a proxy for isoprene-derived hydroperoxyenals (HPALDs). Phys Chem Chem Phys 2012; 14:7276-86. [DOI: 10.1039/c2cp40388a] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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11
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Clifford GM, Hadj-Aïssa A, Healy RM, Mellouki A, Muñoz A, Wirtz K, Martín Reviejo M, Borrás E, Wenger JC. The atmospheric photolysis of o-tolualdehyde. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2011; 45:9649-9657. [PMID: 22007606 DOI: 10.1021/es2026533] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The photolysis of o-tolualdehyde by natural sunlight has been investigated at the large outdoor European Photoreactor (EUPHORE) in Valencia, Spain. The photolysis rate coefficient was measured directly under different solar flux levels, with values in the range j(o-tolualdehyde) = (1.62-2.15) × 10(-4) s(-1) observed, yielding an average value of j(o-tolualdehyde)/j(NO(2)) = (2.53 ± 0.25) × 10(-2). The estimated photolysis lifetime is 1-2 h, confirming that direct photolysis by sunlight is the major atmospheric degradation pathway for o-tolualdehyde. Published UV absorption cross-section data were used to derive an effective quantum yield (290-400 nm) close to unity, within experimental error. Possible reaction pathways for the formation of the major photolysis products, benzocyclobutenol (tentatively identified) and o-phthalaldehyde, are proposed. Appreciable yields (5-13%) of secondary organic aerosol (SOA) were observed at EUPHORE and also during supplementary experiments performed in an indoor chamber using an artificial light source. Off-line analysis by gas chromatography-mass spectrometry allowed identification of o-phthalaldehyde, phthalide, phthalic anhydride, o-toluic acid, and phthalaldehydic acid in the particle phase.
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Affiliation(s)
- Grainne M Clifford
- Department of Chemistry and Environmental Research Institute, University College Cork, Cork, Ireland
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Tadić JM, Moortgat GK, Bera PP, Loewenstein M, Yates EL, Lee TJ. Photochemistry and Photophysics of n-Butanal, 3-Methylbutanal, and 3,3-Dimethylbutanal: Experimental and Theoretical Study. J Phys Chem A 2011; 116:5830-9. [DOI: 10.1021/jp208665v] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Jovan M. Tadić
- NASA Ames Research Center, Moffett Field, Mountain View, California 94035, United States
| | - Geert K. Moortgat
- Atmospheric Chemistry Department, Max-Planck-Institut für Chemie, P.O. Box 3060, 55020 Mainz, Germany
| | - Partha P. Bera
- NASA Ames Research Center, Moffett Field, Mountain View, California 94035, United States
| | - Max Loewenstein
- NASA Ames Research Center, Moffett Field, Mountain View, California 94035, United States
| | - Emma L. Yates
- NASA Ames Research Center, Moffett Field, Mountain View, California 94035, United States
| | - Timothy J. Lee
- NASA Ames Research Center, Moffett Field, Mountain View, California 94035, United States
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13
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Peeters J, Müller JF. HOx radical regeneration in isoprene oxidation via peroxy radical isomerisations. II: experimental evidence and global impact. Phys Chem Chem Phys 2010; 12:14227-35. [DOI: 10.1039/c0cp00811g] [Citation(s) in RCA: 137] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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14
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Xiang B, Zhu C, Zhu L. Gas-phase absorption cross sections of 2-nitrobenzaldehyde and benzaldehyde in the 285–400nm region, and photolysis of 2-nitrobenzaldehyde vapor at 308 and 351nm. Chem Phys Lett 2009. [DOI: 10.1016/j.cplett.2009.04.056] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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15
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16
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Gómez-González Y, Surratt JD, Cuyckens F, Szmigielski R, Vermeylen R, Jaoui M, Lewandowski M, Offenberg JH, Kleindienst TE, Edney EO, Blockhuys F, Van Alsenoy C, Maenhaut W, Claeys M. Characterization of organosulfates from the photooxidation of isoprene and unsaturated fatty acids in ambient aerosol using liquid chromatography/(-) electrospray ionization mass spectrometry. JOURNAL OF MASS SPECTROMETRY : JMS 2008; 43:371-82. [PMID: 17968849 DOI: 10.1002/jms.1329] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
In the present study, we have characterized in detail the MS(2) and MS(3) fragmentation behaviors, using electrospray ionization (ESI) in the negative ion mode, of previously identified sulfated isoprene secondary organic aerosol compounds, including 2-methyltetrols, 2-methylglyceric acid, 2-methyltetrol mononitrate derivatives, glyoxal and methylglyoxal. A major fragmentation pathway for the deprotonated molecules of the sulfate esters of 2-methyltetrols and 2-methylglyceric acid and of the sulfate derivatives of glyoxal and methylglyoxal is the formation of the bisulfate [HSO(4)](-) anion, while the deprotonated sulfate esters of 2-methyltetrol mononitrate derivatives preferentially fragment through loss of nitric acid. Rational interpretation of MS(2), MS(3) and accurate mass data led to the structural characterization of unknown polar compounds in K-puszta fine aerosol as organosulfate derivatives of photooxidation products of unsaturated fatty acids, i.e. 2-hydroxy-1,4-butanedialdehyde, 4,5- and 2,3-dihydroxypentanoic acids, and 2-hydroxyglutaric acid, and of alpha-pinene, i.e. 3-hydroxyglutaric acid. The deprotonated molecules of the sulfated hydroxyacids, 2-methylglyceric acid, 4,5- and 2,3-dihydroxypentanoic acid, and 2- and 3-hydroxyglutaric acids, showed in addition to the [HSO(4)](-) ion (m/z 97) neutral losses of water, CO(2) and/or SO(3), features that are characteristic of humic-like substances. The polar organosulfates characterized in the present work are of climatic relevance because they may contribute to the hydrophilic properties of fine ambient aerosol. In addition, these compounds probably serve as ambient tracer compounds for the occurrence of secondary organic aerosol formation under acidic conditions.
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Affiliation(s)
- Yadian Gómez-González
- Department of Pharmaceutical Sciences, University of Antwerp (Campus Drie Eiken), Universiteitsplein 1, BE-2610 Antwerp, Belgium
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18
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Xiang B, Zhu L. Absorption cross sections of E,E-2,4-hexadienedial at 248nm, and in the 290–430nm region, and photolysis study at 248, 308, and 351nm. Chem Phys Lett 2007. [DOI: 10.1016/j.cplett.2007.11.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Abstract
We have studied the gas-phase photolysis of 4-oxo-2-pentenal by laser photolysis combined with cavity ring-down spectroscopy. Absorption cross sections of cis- and trans-4-oxo-2-pentenal have been measured in the 190-460 nm region. The product channel following 193, 248, 308, and 351 nm photolysis of 4-oxo-2-pentenal was investigated. The HCO radical is a photodissociation product of 4-oxo-2-pentenal only at 193 and 248 nm. The HCO quantum yields from the photolysis of a mainly trans-4-oxo-2-pentenal sample are 0.13 +/- 0.02 and 0.014 +/- 0.003 at 193 and 248 nm, where errors quoted (1sigma) represent experimental scatter. The HCO quantum yields from the photolysis of a mainly cis-4-oxo-2-pentenal sample are 0.078 +/- 0.012 and 0.018 +/- 0.007 at 193 and 248 nm, where errors quoted (1sigma) represent experimental scatter. The end-products from 193, 248, 308, and 351 nm photolysis of 4-oxo-2-pentenal (the 4-oxo-2-pentenal sample had a tran/cis ratio of 1.062:1) have been determined by FTIR. Ethane, methyl vinyl ketone, and 5-methyl-3H-furan-2-one have been observed, suggesting the occurrence of 4-oxo-2-pentenal photolysis pathways such as CH(3)COCH=CHCHO + hnu --> CH(3) + COCH=CHCHO, CH(3)COCH=CHCHO + hnu --> CH(3)COCH=CH(2) + CO, and CH(3)COCH=CHCHO + hnu --> 5-methyl-3H-furan-2-one. The estimated yields for the CH(3) + COCH=CHCHO channel are about 25%, 33%, 31%, and 23% at 193, 248, 308, and 351 nm, respectively. The absolute uncertainties in the determination of CH(3) + COCH=CHCHO yields are within 55% at 193 nm, and 65% at 248, 308, and 351 nm. The estimated yields for the CH(3)COCH=CH(2) + CO channel are about 25%, 23%, 40%, and 33% at 193, 248, 308, and 351 nm, respectively. The absolute uncertainties in the determination of CH(3)COCH=CH(2) yields are within 80% at 193 and 248 nm and 65% at 308 and 351 nm. The estimated yields for the 5-methyl-3H-furan-2-one channel are about 1.2%, 2.1%, 5.3%, and 5.5% at 193, 248, 308, and 351 nm, respectively. The absolute uncertainties in the determination of 5-methyl-3H-furan-2-one yields are about 23%, 86%, 40%, and 46% at 193, 248, 308, and 351 nm. Results from our investigation indicate that photolysis is a dominant removal pathway for 4-oxo-2-pentenal degradation in the atmosphere.
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Affiliation(s)
- Bin Xiang
- Wadsworth Center, New York State Department of Health, New York, USA
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20
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Davis ME, Gilles MK, Ravishankara AR, Burkholder JB. Rate coefficients for the reaction of OH with (E)-2-pentenal, (E)-2-hexenal, and (E)-2-heptenal. Phys Chem Chem Phys 2007; 9:2240-8. [PMID: 17487321 DOI: 10.1039/b700235a] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Rate coefficients for the gas-phase reaction of the OH radical with (E)-2-pentenal (CH(3)CH(2)CH[double bond]CHCHO), (E)-2-hexenal (CH(3)(CH(2))(2)CH[double bond]CHCHO), and (E)-2-heptenal (CH(3)(CH(2))(3)CH[double bond]CHCHO), a series of unsaturated aldehydes, over the temperature range 244-374 K at pressures between 23 and 150 Torr (He, N(2)) are reported. Rate coefficients were measured under pseudo-first-order conditions in OH with OH radicals produced via pulsed laser photolysis of HNO(3) or H(2)O(2) at 248 nm and detected by pulsed laser-induced fluorescence. The rate coefficients were independent of pressure and the room temperature rate coefficients and Arrhenius expressions obtained are (cm(3) molecule(-1) s(-1) units): k(1)(297 K)=(4.3 +/- 0.6)x 10(-11), k(1)(T)=(7.9 +/- 1.2)x 10(-12) exp[(510 +/- 20)/T]; k(2)(297 K)=(4.4 +/- 0.5)x 10(-11), k(2)(T)=(7.5 +/- 1.1)x 10(-12) exp[(520 +/- 30)/T]; and k(3)(297 K)=(4.4 +/- 0.7)x 10(-11), k(3)(T)=(9.7 +/- 1.5)x 10(-12) exp[(450 +/- 20)/T] for (E)-2-pentenal, (E)-2-hexenal and (E)-2-heptenal, respectively. The quoted uncertainties are 2sigma(95% confidence level) and include estimated systematic errors. Rate coefficients are compared with previously published room temperature values and the discrepancies are discussed. The atmospheric degradation of unsaturated aldehydes is also discussed.
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Affiliation(s)
- M E Davis
- Earth System Research Laboratory, Chemical Sciences Division, NOAA, 325 Broadway, Boulder, Colorado 80305-3328, USA
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