Organic Aerosols

Hoffmann, Thorsten; Warnke, Jörg

doi:10.1002/9780470988657.ch9

Cited by 10 publications

(9 citation statements)

References 215 publications

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“…A number of molecules representing anthropogenic organic compounds such as linear and branched alkanes and alkenes, 27 alkynes, 28 aromatics, polycyclic aromatic hydrocarbons, and their oxygenated and nitro-substituted products 29 (e.g., nitro and hydroxy xylenes, nitro methylnaphthalene) 29 are available commercially. Some oxidation products for more complex molecules representing important atmospheric biogenic VOCs such as isoprene, monoterpenes (i.e., -pinene, -pinene, limonene, myrcene, terpinylene), and sesquiterpenes (i.e., -caryophyllene, -humulene, -cedrene, -farnesene, etc.)…”

Section: A) Availability Of Authentic Standardsmentioning

confidence: 99%

The Molecular Identification of Organic Compounds in the Atmosphere: State of the Art and Challenges

et al. 2015

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Section: A) Availability Of Authentic Standardsmentioning

confidence: 99%

The Molecular Identification of Organic Compounds in the Atmosphere: State of the Art and Challenges

et al. 2015

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“…This complex chain of gas–phase reactions is strongly altered by the presence of particles within the system because heterogeneous processes can then take place, where VOCs and their oxidation products are removed from the gas phase either by adsorption into hydrophobic carbon particles or by partition into the water layer covering the hygroscopic ones. Both removal processes are quite selective because they depend on the vapour pressure, and the functional groups of the VOC molecules (Hoffmann & Warnke ). Because their solubility in water, many polar VOCs, such as alcohols, acids, phenols and hydroxyl‐furans, are preferentially transferred into the water layer surrounding hygroscopic particles (Finnlayson‐Pitts & Pitts ; Hoffmann & Warnke ).…”

Section: General Reactions Of Vocs In Fire Plumesmentioning

confidence: 99%

“…Both removal processes are quite selective because they depend on the vapour pressure, and the functional groups of the VOC molecules (Hoffmann & Warnke ). Because their solubility in water, many polar VOCs, such as alcohols, acids, phenols and hydroxyl‐furans, are preferentially transferred into the water layer surrounding hygroscopic particles (Finnlayson‐Pitts & Pitts ; Hoffmann & Warnke ). Fine particles also act as seeds for the formation of SOA from the oxidation products of some VOCs (Hoffmann & Warnke ).…”

Section: General Reactions Of Vocs In Fire Plumesmentioning

confidence: 99%

“…Because their solubility in water, many polar VOCs, such as alcohols, acids, phenols and hydroxyl‐furans, are preferentially transferred into the water layer surrounding hygroscopic particles (Finnlayson‐Pitts & Pitts ; Hoffmann & Warnke ). Fine particles also act as seeds for the formation of SOA from the oxidation products of some VOCs (Hoffmann & Warnke ). In combustion plumes, seed particles are mostly composed of carbon particles and ammonium sulphate and nitrate salts formed by the photochemical oxidation of sulphur and nitrogen compounds by OH radicals (Finnlayson‐Pitts & Pitts ).…”

Section: General Reactions Of Vocs In Fire Plumesmentioning

confidence: 99%

“…Their decomposition generates the same products that are formed by the reaction with OH radicals (Atkinson & Arey ). Ozonolysis of monoterpenes produces acidic species that are able to form SOAs by condensation between themselves or through interaction with seed particles (Hoffmann & Warnke ).…”

Section: Emissions and Reactions Of Bvocs In Different Fire Plume Regmentioning

confidence: 99%

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Biogenic volatile organic compound emissions from vegetation fires

Ciccioli

Centritto

Loreto

2014

Plant Cell & Environment

117

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The aim of this paper was to provide an overview of the current state of the art on research into the emission of biogenic volatile organic compounds (BVOCs) from vegetation fires. Significant amounts of VOCs are emitted from vegetation fires, including several reactive compounds, the majority belonging to the isoprenoid family, which rapidly disappear in the plume to yield pollutants such as secondary organic aerosol and ozone. This makes determination of fire-induced BVOC emission difficult, particularly in areas where the ratio between VOCs and anthropogenic NOx is favourable to the production of ozone, such as Mediterranean areas and highly anthropic temperate (and fire-prone) regions of the Earth. Fire emissions affecting relatively pristine areas, such as the Amazon and the African savannah, are representative of emissions of undisturbed plant communities. We also examined expected BVOC emissions at different stages of fire development and combustion, from drying to flaming, and from heatwaves coming into contact with unburned vegetation at the edge of fires. We conclude that forest fires may dramatically change emission factors and the profile of emitted BVOCs, thereby influencing the chemistry and physics of the atmosphere, the physiology of plants and the evolution of plant communities within the ecosystem.

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Green Leaf Volatiles on Atmospheric Air/Water Interfaces: A Combined Experimental and Molecular Simulation Study

Liyana-Arachchi

Zhang²,

Vempati³

et al. 2014

J. Chem. Eng. Data

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Green leaf volatiles (GLVs) are a family of oxygenated hydrocarbons emitted in large quantities by plants, especially those under mechanical stress or damage. GLVs can significantly contribute to the formation of secondary organic aerosols (SOAs) by reacting with oxidants in atmospheric water droplets (fog, mist, and rain). Here we investigated the properties of four GLVs, 2-methyl-3-buten-2-ol (MBO), methyl salicylate (MeSA), cis-3-hexen-1-ol (HxO), and cis-3-hexenylacetate (HxAc) in air/water systems at 298 K using a combination of experiments and molecular simulations. Good agreement between simulation and experimental results of the 1-octanol/water partition coefficients and the free energy of hydration of the GLVs ensure the suitability of our molecular models for these systems; likewise, surface concentrations determined from experimental measurements of the surface tensions of these systems compared favorably against trends determined from molecular simulations. Our simulations indicate that all four GLVs exhibit deep free energy minima at the air/water interfaces; the stability of the GLV solutes at the air/water interface is mainly driven by energetic interactions between these solutes and water molecules. Our results suggest that the air/water interface is the most likely site for chemical reactions between GLVs and atmospheric oxidants. Such a finding has important implications in the kinetics and mechanisms of these reactions, which can be significantly different from those observed when these reactions take place in the gas phase or in the bulk of water phases.

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Organic Aerosols

Cited by 10 publications

References 215 publications

The Molecular Identification of Organic Compounds in the Atmosphere: State of the Art and Challenges

The Molecular Identification of Organic Compounds in the Atmosphere: State of the Art and Challenges

Biogenic volatile organic compound emissions from vegetation fires

Green Leaf Volatiles on Atmospheric Air/Water Interfaces: A Combined Experimental and Molecular Simulation Study

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