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000902269 1001_ $$00000-0002-5100-0858$$aTsiligiannis, Epameinondas$$b0
000902269 245__ $$aEffect of NOx on 1,3,5-trimethylbenzene (TMB) oxidation product distribution and particle formation
000902269 260__ $$aKatlenburg-Lindau$$bEGU$$c2019
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000902269 520__ $$aSecondary organic aerosol (SOA) represents a significant fraction of the tropospheric aerosol and its precursors are volatile organic compounds (VOCs). Anthropogenic VOCs (AVOC) dominate the VOC budget in many urban areas with 1,3,5-trimethylbenzene (TMB) being among the most reactive aromatic AVOCs. TMB formed highly oxygenated organic molecules (HOMs) in an NOx-free environment, which could contribute to new particle formation (NPF) depending on oxidation conditions where elevated OH oxidation enhanced particle formation. The experiments were performed in an oxidation flow reactor, the Go:PAM unit, under controlled OH oxidation conditions. By addition of NOx to the system we investigated the effect of NOx on particle formation and on the product distribution. We show that the formation of HOMs, and especially HOM accretion products, strongly varies with NOx conditions. We observe a suppression of HOM and particle formation with increasing NOx/ΔTMB ratio and an increase in the formation of organonitrates (ONs) mostly at the expense of HOM accretion products. We propose reaction mechanisms and pathways that explain the formation and observed product distributions with respect to oxidation conditions. We hypothesise that, based on our findings from TMB oxidation studies, aromatic AVOCs may not contribute significantly to NPF under typical NOx/AVOC conditions found in urban atmospheres.
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000902269 7001_ $$00000-0003-2333-2596$$aHammes, Julia$$b1
000902269 7001_ $$00000-0002-8328-7777$$aSalvador, Christian Mark$$b2
000902269 7001_ $$0P:(DE-Juel1)16346$$aMentel, Thomas F.$$b3
000902269 7001_ $$0P:(DE-HGF)0$$aHallquist, Mattias$$b4$$eCorresponding author
000902269 773__ $$0PERI:(DE-600)2069847-1$$a10.5194/acp-19-15073-2019$$gVol. 19, no. 23, p. 15073 - 15086$$n23$$p15073 - 15086$$tAtmospheric chemistry and physics$$v19$$x1680-7324$$y2019
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