Seasonal and particle size-dependent variations in gas/particle partitioning of PCDD/Fs.
This study monitored particle size-dependent variations in atmospheric polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs). Two gas/particle partitioning models, the subcooled liquid vapor pressure (P(L)(0)) and the octanol-air partition coefficient (K(OA)) model, were applied to each particle sizes. The regression coefficients of each fraction against the gas/particle partition coefficient (K(P)) were similar for separated particles within the same sample set but differed for particles collected during different periods. Gas/particle partitioning calculated from the integral of fractions was similar to that of size-segregated particles and previously measured bulk values. Despite the different behaviors and production mechanisms of atmospheric particles of different sizes, PCDD/F partitioning of each size range was controlled by meteorological conditions such as atmospheric temperature, O(3) and UV, which reflects no source related with certain particle size ranges but mixed urban sources within this city. Our observations emphasize that when assessing environmental and health effects, the movement of PCDD/Fs in air should be considered in conjunction with particle size in addition to the bulk aerosol.
Lee
Se-Jin
SJ
School of Environmental Science & Engineering, Pohang University of Science and Technology, POSTECH, Nam-Gu, Pohang, South Korea.
Ale
Debaki
D
Chang
Yoon-Seok
YS
Oh
Jeong-Eun
JE
Shin
Sun Kyoung
SK
D000388:Air / Q000032:analysis*; D000392:Air Movements; D000395:Air Pollutants, Occupational / Q000032:analysis*; D001572:Benzofurans / Q000032:analysis*; D004784:Environmental Monitoring / Q000379:methods; D005740:Gases; D008956:Models, Chemical; D010126:Ozone / Q000737:chemistry; D010316:Particle Size; D000072317:Polychlorinated Dibenzodioxins / Q000031:analogs & derivatives* / Q000032:analysis; D012621:Seasons; D013696:Temperature; D014466:Ultraviolet Rays
D000395:Air Pollutants, Occupational; D001572:Benzofurans; D005740:Gases; D000072317:Polychlorinated Dibenzodioxins; D010126:Ozone; C023614:dibenzofuran