title: Measured Saturation Vapor Pressures of Phenolic and Nitro-aromatic Compounds.
abstract: Phenolic and nitro-aromatic compounds are extremely toxic components of atmospheric aerosol that are currently not well understood. In this Article, solid and subcooled-liquid-state saturation vapor pressures of phenolic and nitro-aromatic compounds are measured using Knudsen Effusion Mass Spectrometry (KEMS) over a range of temperatures (298-318 K). Vapor pressure estimation methods, assessed in this study, do not replicate the observed dependency on the relative positions of functional groups. With a few exceptions, the estimates are biased toward predicting saturation vapor pressures that are too high, by 5-6 orders of magnitude in some cases. Basic partitioning theory comparisons indicate that overestimation of vapor pressures in such cases would cause us to expect these compounds to be present in the gas state, whereas measurements in this study suggest these phenolic and nitro-aromatic will partition into the condensed state for a wide range of ambient conditions if absorptive partitioning plays a dominant role. While these techniques might have both structural and parametric uncertainties, the new data presented here should support studies trying to ascertain the role of nitrogen containing organics on aerosol growth and human health impacts.
authors.affiliation: School of Earth, Environmental and Atmospheric Science, University of Manchester , 4.30 Simon Building, Oxford Road, Manchester, M13 9PL, U.K.
authors.forename: Thomas J
authors.identifier: 0000-0002-1760-6522
authors.initials: TJ
authors.lastname: Bannan
authors.affiliation: School of Earth, Environmental and Atmospheric Science, University of Manchester , 4.30 Simon Building, Oxford Road, Manchester, M13 9PL, U.K.
authors.forename: A Murray
authors.initials: AM
authors.lastname: Booth
authors.affiliation: School of Earth, Environmental and Atmospheric Science, University of Manchester , 4.30 Simon Building, Oxford Road, Manchester, M13 9PL, U.K.
authors.forename: Benjamin T
authors.initials: BT
authors.lastname: Jones
authors.affiliation: School of Earth, Environmental and Atmospheric Science, University of Manchester , 4.30 Simon Building, Oxford Road, Manchester, M13 9PL, U.K.
authors.forename: Simon
authors.initials: S
authors.lastname: O'Meara
authors.affiliation: School of Earth, Environmental and Atmospheric Science, University of Manchester , 4.30 Simon Building, Oxford Road, Manchester, M13 9PL, U.K.
authors.forename: Mark H
authors.initials: MH
authors.lastname: Barley
authors.affiliation: Department of Environmental Science and Analytical Chemistry (ACES), Stockholm University , SE-11418 Stockholm, Sweden.
authors.forename: Ilona
authors.initials: I
authors.lastname: Riipinen
authors.affiliation: School of Earth, Environmental and Atmospheric Science, University of Manchester , 4.30 Simon Building, Oxford Road, Manchester, M13 9PL, U.K.
authors.forename: Carl J
authors.initials: CJ
authors.lastname: Percival
authors.affiliation: School of Earth, Environmental and Atmospheric Science, University of Manchester , 4.30 Simon Building, Oxford Road, Manchester, M13 9PL, U.K.|National Centre for Atmospheric Science, University of Manchester , Manchester, M13 9PL, U.K.
authors.forename: David
authors.initials: D
authors.lastname: Topping
mesh_terms: D009574:Nitro Compounds; D011084:Polycyclic Aromatic Hydrocarbons; D013696:Temperature; D055548:Vapor Pressure; D014835:Volatilization
chemical_list: D009574:Nitro Compounds; D011084:Polycyclic Aromatic Hydrocarbons