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Sci Total Environ

Title:		Behaviour of traffic emitted semi-volatile and intermediate volatility organic compounds within the urban atmosphere
Author(s):		Xu R; Alam MS; Stark C; Harrison RM;
Address:		"Division of Environmental Health and Risk Management, School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom. Division of Environmental Health and Risk Management, School of Geography, Earth and Environmental Sciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom. Electronic address: r.m.harrison@bham.ac.uk"
Journal Title:		Sci Total Environ
Year:		2020
Volume:		20200220
Issue:
Page Number:		137470 -
DOI:		10.1016/j.scitotenv.2020.137470
ISSN/ISBN:		1879-1026 (Electronic) 0048-9697 (Linking)
Abstract:		"Particulate matter originated from traffic has attracted major interest over the last few years. The semi-volatile organic component of the particles may evaporate with dispersion away from the emission source, creating vapour which may oxidise to form secondary organic aerosol. Air samples were collected from a street canyon, the adjacent park and an urban background site during the winter-spring period in central London, UK. Emissions of semi-volatile organic compounds (SVOCs) and intermediate volatility organic compounds (IVOCs) ranging from C(10) to C(36) in both the gas phase and particle phase were measured by using thermal desorption coupled to comprehensive two-dimensional gas chromatography time-of-flight mass spectrometry (TD-GC x GC-ToF-MS). Main compound groups identified and quantified were grouped alkanes (n-alkanes and branched alkanes), monocyclic alkanes, bicyclic alkanes and monocyclic aromatics. The carbon preference index (CPI) of n-alkanes was estimated to distinguish the emission sources. Pearson correlations between I/SVOCs and traffic tracers (black carbon, NO(x) and benzene) in different locations were compared to analyse the influence of this emission source. The results indicate that while the major emission source at the roadside site is traffic, the lower correlations at background sites are indicative of other source contributions and/or differential reactivity of compounds. Gas-particle phase partitioning of n-alkanes is evaluated and compared between sites. The potential influence of gas phase I/SVOCs upon OH reactivity and secondary organic aerosol (SOA) formation is estimated and found to be relatively small"
Keywords:		Alkanes Aromatics Diesel exhaust Intermediate volatility organic compounds Semi-volatile organic compounds;
Notes:		"PubMed-not-MEDLINEXu, Ruixin Alam, Mohammed S Stark, Christopher Harrison, Roy M eng Netherlands 2020/04/25 Sci Total Environ. 2020 Jun 10; 720:137470. doi: 10.1016/j.scitotenv.2020.137470. Epub 2020 Feb 20"