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Title: Size distributions of polycyclic aromatic hydrocarbons in urban atmosphere: Sorption mechanism and source contributions to respiratory deposition
Authors: Lv, YanLi, XiangXu, Ting TingCheng, Tian TaoYang, XinChen, Jian MinIinuma, YoshiteruHerrmann, Hartmut
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Issue Date: 2016
Published in: Atmospheric Chemistry and Physics, Volume 16, Issue 5, Page 2971-2983
Publisher: München : European Geopyhsical Union
Abstract: In order to better understand the particle size distribution of polycyclic aromatic hydrocarbons (PAHs) and their source contribution to human respiratory system, size-resolved PAHs have been studied in ambient aerosols at a megacity Shanghai site during a 1-year period (2012–2013). The results showed the PAHs had a bimodal distribution with one mode peak in the fine-particle size range (0.4–2.1 µm) and another mode peak in the coarse-particle size range (3.3–9.0 µm). Along with the increase in ring number of PAHs, the intensity of the fine-mode peak increased, while the coarse-mode peak decreased. Plotting of log(PAH / PM) against log(Dp) showed that all slope values were above −1, suggesting that multiple mechanisms (adsorption and absorption) controlled the particle size distribution of PAHs. The total deposition flux of PAHs in the respiratory tract was calculated as being 8.8 ± 2.0 ng h−1. The highest lifetime cancer risk (LCR) was estimated at 1.5  ×  10−6, which exceeded the unit risk of 10−6. The LCR values presented here were mainly influenced by accumulation mode PAHs which came from biomass burning (24 %), coal combustion (25 %), and vehicular emission (27 %). The present study provides us with a mechanistic understanding of the particle size distribution of PAHs and their transport in the human respiratory system, which can help develop better source control strategies.
Keywords: aerosol; biomass burning; exhaust emission; PAH; particle size; point source; respiration; size distribution; urban atmosphere
DDC: 550
License: CC BY 3.0 Unported
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