title: Supercooled liquid vapour pressures and related thermodynamic properties of polycyclic aromatic hydrocarbons determined by gas chromatography.
abstract: A gas chromatographic method using Kováts retention indices has been applied to determine the liquid vapour pressure (P(i)), enthalpy of vaporization (DeltaH(i)) and difference in heat capacity between gas and liquid phase (DeltaC(i)) for a group of polycyclic aromatic hydrocarbons (PAHs). This group consists of 19 unsubstituted, methylated and sulphur containing PAHs. Differences in log P(i) of -0.04 to +0.99 log units at 298.15K were observed between experimental values and data from effusion and gas saturation studies. These differences in log P(i) have been fitted with multilinear regression resulting in a compound and temperature dependent correction. Over a temperature range from 273.15 to 423.15K, differences in corrected log P(i) of a training set (-0.07 to +0.03 log units) and a validation set (-0.17 to 0.19 log units) were within calculated error ranges. The corrected vapour pressures also showed a good agreement with other GC determined vapour pressures (average -0.09 log units).
authors.affiliation: Department of Earth Surface Processes and Materials, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands. jhaftka@science.uva.nl
authors.forename: Joris J H
authors.initials: JJ
authors.lastname: Haftka
authors.forename: John R
authors.initials: JR
authors.lastname: Parsons
authors.forename: Harrie A J
authors.initials: HA
authors.lastname: Govers
mesh_terms: D000393:Air Pollutants / Q000032:analysis; D002849:Chromatography, Gas / Q000379:methods*; D005740:Gases; D044367:Phase Transition; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis*; D013816:Thermodynamics; D001335:Vehicle Emissions / Q000032:analysis; D014835:Volatilization
chemical_list: D000393:Air Pollutants; D005740:Gases; D011084:Polycyclic Aromatic Hydrocarbons; D001335:Vehicle Emissions