The heterogeneous kinetics of HOBr and HOCl on acidified sea salt and model aerosol at 40–90% relative humidity and ambient temperature

Pratte, Pascal; Rossi, Michel J.

doi:10.1039/b604321f

Cited by 22 publications

(20 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Zero air from a pure-air generator (Aadco Instruments, Inc., Cleves OH, USA) was used. A 104 cm long Pyrex glass tube of 7.4 cm diameter described previously (Pratte and Rossi, 2006) was used as a flow tube. Vapors of the aromatic compounds were generated from a glass vial and collected by a stream of zero air (1.1 L min −1 ) via a glass capillary for liquid compounds (and from a flask flushed with the same stream of zero air for solid compounds).…”

Section: Flow Tubementioning

confidence: 99%

Formation of highly oxygenated organic molecules from aromatic compounds

et al. 2018

Self Cite

View full text Add to dashboard Cite

Abstract. Anthropogenic volatile organic compounds (AVOCs) often dominate the urban atmosphere and consist to a large degree of aromatic hydrocarbons (ArHCs), such as benzene, toluene, xylenes, and trimethylbenzenes, e.g., from the handling and combustion of fuels. These compounds are important precursors for the formation of secondary organic aerosol. Here we show that the oxidation of aromatics with OH leads to a subsequent autoxidation chain reaction forming highly oxygenated molecules (HOMs) with an O : C ratio of up to 1.09. This is exemplified for five single-ring ArHCs (benzene, toluene, o-/m-/p-xylene, mesitylene (1,3,5-trimethylbenzene) and ethylbenzene), as well as two conjugated polycyclic ArHCs (naphthalene and biphenyl). We report the elemental composition of the HOMs and show the differences in the oxidation patterns of these ArHCs. A potential pathway for the formation of these HOMs from aromatics is presented and discussed. We hypothesize that AVOCs may contribute substantially to new particle formation events that have been detected in urban areas.

show abstract

Section: Flow Tubementioning

confidence: 99%

Formation of highly oxygenated organic molecules from aromatic compounds

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…Zero air from a pure air generator (Aadco Instruments, Inc., Cleves OH, USA) was used. A 104-cm long Pyrex glass tube of 7.4 cm diameter described previously (Pratte and Rossi, 2006) was used as a flow tube. Vapours of the aromatic compounds were generated from a glass vial, and collected by a stream of zero air (1.1 L min -1 ) via a glass capillary for liquid compounds (and from a flask flushed with the same stream of zero air for solid compounds).…”

Section: Flow Tubementioning

confidence: 99%

Formation of highly oxygenated organic molecules from aromatic compounds

Molteni¹,

Bianchi²,

Klein³

et al. 2016

Preprint

Self Cite

View full text Add to dashboard Cite

Abstract. Anthropogenic volatile organic compounds (AVOC) often dominate the urban atmosphere and consist to a large degree of aromatic hydrocarbons (ArHC), such as benzene, toluene, xylenes, and trimethylbenzenes, e.g. from handling and combustion of fuels. These compounds are important precursors for the formation of secondary organic aerosol. Despite their recognized importance as atmospheric reactants, the formation of highly oxygenated molecules (HOMs) in the gas phase leading to (extremely) low volatility compounds has not been studied in the past. Here we show that oxidation of aromatics with OH leads to a subsequent autoxidation chain reaction forming HOMs with an O&#8201;:&#8201;C ratio of up to 1.09. This is exemplified for five single-ring ArHC (benzene, toluene, o-/m-/p-xylene, mesitylene (1,3,5-trimethylbenzene) and ethylbenzene), as well as two conjugated polycyclic ArHC (naphthalene and biphenyl). We present the identified compounds, differences in the observed oxidation patterns and discuss mechanistic pathways. We hypothesize that AVOC may contribute substantially to new particle formation events that have been detected in urban areas.

show abstract

“…The model uses α HOCl =0.5, based on laboratory measurements of uptake of HOBr on NaCl and NaBr aerosols (Abbatt and Waschewsky, 1998;Wachsmuth et al, 2002). Recent experiments with aerosols generated from acidified natural seawater show a lower γ HOCl of 0.0004-0.0018 and unusual relative humidity dependence (Pratte and Rossi, 2006). These observations and some model simulations suggest that organic surface films may inhibit HOCl uptake (Smoydzin and von Glasow, 2007).…”

Section: New CL X Source With Low Hocl Uptake Coefficient (Newsource+mentioning

confidence: 99%

HOCl and Cl2 observations in marine air

et al. 2011

View full text Add to dashboard Cite

Abstract. Cl atoms in the marine atmosphere may significantly impact the lifetimes of methane and other hydrocarbons. However, the existing estimates of Cl atom levels in marine air are based on indirect evidence. Here we present measurements of the Cl precursors HOCl and Cl2 in the marine boundary layer during June of 2009 at the Cape Verde Atmospheric Observatory in the eastern tropical Atlantic. These are the first measurements of tropospheric HOCl. HOCl and Cl2 levels were low in air with open ocean back trajectories, with maximum levels always below 60 and 10 ppt (pmol/mol), respectively. In air with trajectories originating over Europe, HOCl and Cl2 levels were higher, with HOCl maxima exceeding 100 ppt each day and Cl2 reaching up to 35 ppt. The increased Cl cycling associated with long distance pollutant transport over the oceans likely impacts a wide geographic area and represents a mechanism by which human activities have increased the reactivity of the marine atmosphere. Data-constrained model simulations indicate that Cl atoms account for approximately 15 % of methane destruction on days when aged polluted air arrives at the site. A photochemical model does not adequately simulate the observed abundances of HOCl and Cl2, raising the possibility of an unknown HOCl source.

show abstract

The heterogeneous kinetics of HOBr and HOCl on acidified sea salt and model aerosol at 40–90% relative humidity and ambient temperature

Cited by 22 publications

References 62 publications

Formation of highly oxygenated organic molecules from aromatic compounds

Formation of highly oxygenated organic molecules from aromatic compounds

Formation of highly oxygenated organic molecules from aromatic compounds

HOCl and Cl<sub>2</sub> observations in marine air

Contact Info

Product

Resources

About

The heterogeneous kinetics of HOBr and HOCl on acidified sea salt and model aerosol at 40–90% relative humidity and ambient temperature

Cited by 22 publications

References 62 publications

Formation of highly oxygenated organic molecules from aromatic compounds

Formation of highly oxygenated organic molecules from aromatic compounds

Formation of highly oxygenated organic molecules from aromatic compounds

HOCl and Cl&lt;sub&gt;2&lt;/sub&gt; observations in marine air

Contact Info

Product

Resources

About

HOCl and Cl<sub>2</sub> observations in marine air