Atmospheric deposition of polycyclic aromatic hydrocarbons to water surfaces: A mass balance approach

Diurnal and seasonal variability in size-dependent atmospheric deposition fluxes of polycyclic aromatic hydrocarbons in an urban center

“…Contrary to the results in the present study, monotonically increasing V values of individual PAHs with decreasing sub-cooled liquid vapor pressures were obtained in previous studies, which was attributed to the enrichment of low molecular weight PAHs in the gaseous phase (McVeety and Hites, 1988;Sheu et al, 1996); however, contradicting results were reported from Greece (Terzi and Samara, 2005). The difference may be partially explained by different meteorological conditions that lead to differences in the dispersion, distribution and deposition of atmospheric pollutants (Lang et al, 2002) equilibrium partitioning between the gaseous and particulate phases leads to differences in PAH size distributions, as discussed above.…”

Mass transfer coefficients for polycyclic aromatic hydrocarbons (PAHs) to the water surface sampler:

“…The sampling and analytical methods are described in detail elsewhere (Odabasi, 1998;Odabasi et al, 1999a, b) and will only be brie#y described here. Twelve dry deposition and ambient air samples were collected between June and October 1995 on the roof of a four-story building (12-m height) located on the campus of Illinois Institute of Technology during the daytime when there was no precipitation.…”

“…Total (particulate#gas) PAH #uxes were measured using an aerodynamically smooth circular water collection surface while the particulate-phase dry deposition #ux was measured using smooth, greased plates with a sharp leading edge (Odabasi, 1998;Odabasi et al, 1999a). Two water surface samplers, one containing a "lter holder and a resin column in the water recirculation line (WSS1) and one containing only a resin column in the water recirculation line (WSS2) were used during sampling.…”

“…The calculated gas-phase #uxes and results of ambient concentration measurements were reported previously (Odabasi et al, 1999a, b). Possible sampling artifacts for ambient samples (breakthrough of cartridge, adsorption or volatilization from "lter) evaluated elsewhere using Junge}Pankow partitioning modeling and quality assurance, quality control requirements (Odabasi, 1998: Odabasi et al, 1999b and it was concluded that measured concentrations were representative of air concentrations. Possible sampling artifacts associated with the WSS and dry deposition plates are discussed in detail elsewhere and will only be brie#y discussed here (Odabasi et al, 1999a).…”

“…et al, 1996;Pirrone et al, 1995;Erickson, 1987;Wanninkhof, 1992;Gustafson and Dickhut, 1997;McConnell et al, 1997). The mass balance approach has also been used to make estimates of air}water gas exchange (McVeety and Hites, 1988).…”