Simulation chamber studies of the atmospheric degradation of naphthalene, 1-nitronaphthalene and phthaldialdehyde

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dc.contributor.advisor Wenger, John C.
dc.contributor.author Chen, Yang
dc.date.accessioned 2012-07-04T08:52:02Z
dc.date.available 2015-07-04T04:00:04Z
dc.date.issued 2012-04
dc.date.submitted 2012-06-25
dc.identifier.citation Chen, Y, 2012. Simulation chamber studies of the atmospheric degradation of naphthalene, 1-nitronaphthalene and phthaldialdehyde. PhD Thesis, University College Cork. en
dc.identifier.uri http://hdl.handle.net/10468/622
dc.description.abstract A detailed series of simulation chamber experiments has been performed on the atmospheric degradation pathways of the primary air pollutant naphthalene and two of its photooxidation products, phthaldialdehyde and 1-nitronaphthalene. The measured yields of secondary organic aerosol (SOA) arising from the photooxidation of naphthalene varied from 6-20%, depending on the concentrations of naphthalene and nitrogen oxides as well as relative humidity. A range of carbonyls, nitro-compounds, phenols and carboxylic acids were identified among the gas- and particle-phase products. On-line analysis of the chemical composition of naphthalene SOA was performed using aerosol time-of-flight mass spectrometry (ATOFMS) for the first time. The results indicate that enhanced formation of carboxylic acids may contribute to the observed increase in SOA yields at higher relative humidity. The photolysis of phthaldialdehyde and 1-nitronaphthalene was investigated using natural light at the European Photoreactor (EUPHORE) in Valencia, Spain. The photolysis rate coefficients were measured directly and used to confirm that photolysis is the major atmospheric loss process for these compounds. For phthaldialdehyde, the main gas-phase products were phthalide and phthalic anhydride. SOA yields in the range 2-11% were observed, with phthalic acid and dihydroxyphthalic acid identified among the particle phase products. The photolysis of 1-nitronaphthalene yielded nitric oxide and a naphthoxy radical which reacted to form several products. SOA yields in the range 57-71% were observed, with 1,4-naphthoquinone, 1-naphthol and 1,4-naphthalenediol identified in the particle phase. On-line analysis of the SOA generated in an indoor chamber using ATOFMS provided evidence for the formation of high-molecular-weight products. Further investigations revealed that these products are oxygenated polycyclic compounds most likely produced from the dimerization of naphthoxy radicals. These results of this work indicate that naphthalene is a potentially large source of SOA in urban areas and should be included in atmospheric models. The kinetic and mechanistic information could be combined with existing literature data to produce an overall degradation mechanism for naphthalene suitable for inclusion in photochemical models that are used to predict the effect of emissions on air quality. en
dc.description.sponsorship Environmental Protection Agency (STRIVE Doctoral Scholarships Programme (2008-PhD-AQ1)) en
dc.description.sponsorship Environmental Protection Agency (STRIVE Doctoral Scholarships Programme (2008-PhD-AQ1) en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher University College Cork en
dc.rights © 2012, Yang Chen en
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/ en
dc.subject Secondary organic aerosol en
dc.subject Photolysis en
dc.subject.lcsh Atmospheric chemistry en
dc.subject.lcsh Organic reaction mechanisms en
dc.subject.lcsh Naphthalene en
dc.title Simulation chamber studies of the atmospheric degradation of naphthalene, 1-nitronaphthalene and phthaldialdehyde en
dc.type Doctoral thesis en
dc.type.qualificationlevel Doctoral en
dc.type.qualificationname PhD (Chemistry) en
dc.internal.availability Full text available en
dc.description.version Accepted Version en
dc.contributor.funder Environmental Protection Agency en
dc.description.status Not peer reviewed en
dc.internal.school Chemistry en
dc.internal.school Environmental Research Institute en


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