John Wiley & Sons, Ltd.

Deposition flux of aerosol particles and 15 PAHs in the North China Plain

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Deposition fluxes of aerosol particles and 15 PAHs associated with the particles in the North China Plain were examined. The annual mean deposition fluxes of aerosol particles and 15 PAHs were 0.69 ± 0.46 g/(m2 · d) and 8.5 ± 6.2 μg/(m2 · d), respectively. Phenanthrene, fluoranthene, pyrene, chrysene, benzo[b]fluoranthene and benzo[k]fluoranthene were dominant PAHs bound to deposited aerosol particles throughout the year. The total concentration of 15 PAHs in the deposited aerosol particles was the highest in winter but lowest in spring. The highest PAH concentration in the deposited aerosol particles in winter was because of the heating processes highly increased its concentration in the atmospheric aerosol particles. Low temperature and weak sunshine in winter reduced degradation rate of deposited aerosol particle‐bound PAHs especially for those with low molecular weight (MW). The lowest PAH concentration in deposited aerosol particles in spring resulted from the frequently occurring duststorms which diluted PAH concentrations. The mean deposition flux of PAHs with aerosol particles in winter (16 μg/(m2 · d)) reached 3–5 times of that in other seasons (3.5–5.0 μg/(m2 · d)). Spatial variation of the deposition flux of PAHs with high MW (e.g., BaP) was consistent with their concentrations in the atmospheric aerosol particles, whereas such a phenomenon was not observed for those with low MW (e.g., PHE), due to their distinct hydrophobicity and Henry's law constant and the spatially heterogeneous meteorological conditions. Environ Toxicol Chem © 2013 SETAC

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