A Study Of Gas-particle Partitioning Of PAH
According To Adsorptive Models And Season
Author(s)
S. Pongpiachan, K. F. Ho & S. C. Lee
Abstract
Vapour-phase and particulate air samples were collected in a rural area of
England in a cold period (20/11/2003 - 22/12/2003) and a warm period (5/5/2004
- 26/5/2004) to investigate the seasonal effect on gas-particle partitioning of
PAHs. Three different sorptive models, namely Dachs-Eisenreich
(ab/adsorption), KOA (absorption into organic layer) and KSA (adsorption on the
soot surface) were applied and, as expected, the inclusion of an adsorptive
mechanism provided better predictions of KP values for all PAHs. The ratios of
measured-KP/Dachs-Eisenreich-KP are 1.03 ± 0.12 and 1.06 ± 0.15 in the cold
period and warm period respectively for a group of medium molecular weight
compounds. The model results indicate a far greater importance for both
adsorptive and absorption processes rather than the absorption mechanism alone
in determining the gas-particle partitioning of PAH. There was little difference
between log KP values for the medium and high molecular weight PAH between
the warm period and cold period campaigns despite a difference in mean
temperature of 10ºC. This can be explained by a difference in aerosol properties
between the two campaigns and it is postulated to be attributable in minor part to
a greater fraction of elemental carbon present in the warm period aerosol, which
derives from a greater proportion of continental air masses than in the cold
period, but predominantly to the lesser relative humidity in the warm period
Keywords
polycyclic aromatic hydrocarbons, organic carbon, elemental carbon, gas-particle partitioning coefficient, absorption, adsorption, seasonal variation
Related Book
Other papers in this volume
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