Atmospheric Dry Deposition of Polychlorinated Dibenzo-p-Dioxins/Dibenzofurans (PCDD/Fs) and Polychlorinated Biphenyls (PCBs) in Southern Taiwan

doi:10.4209/aaqr.2012.07.0172

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Title:	Atmospheric Dry Deposition of Polychlorinated Dibenzo-p-Dioxins/Dibenzofurans (PCDD/Fs) and Polychlorinated Biphenyls (PCBs) in Southern Taiwan
Authors:	Mi, Hsiao-Hsuan Wu, Zong-Sian Lin, Long-Full Lai, Yi-Chieh Lee, Yen-Yi Wang, Lin-Chi Chang-Chien, Guo-Ping Wang, Lin-Chi� Wang, Lin-Chi�
Contributors:	環境工程與科學系
Keywords:	Polychlorinated Dibenzo-P-Dioxins/Dibenzofurans (Pcdd/Fs) Polychlorinated Biphenyls (Pcbs) Gas-Particle Partitioning Dry Deposition Flux Dry Deposition Velocity
Date:	2012-10
Issue Date:	2014-03-21 16:13:30 (UTC+8)
Publisher:	Taiwan Assoc Aerosol Res-Taar
Abstract:	Dry deposition is one of the major routes by which air pollutants enter the ecosystem, and thus this study investigated the dry deposition characteristics of polychlorinated dibenzo-p-dioxins/dibenzofurans (PCDD/Fs) and biphenyls (PCBs) in the ambient air of industrial, urban, and rural areas in southern Taiwan from November 2010 to May 2011. Average dry deposition fluxes of total PCDD/Fs and PCBs in the ambient air of four sites were 157-544 pg/m(2)-day (8.30-27.5 pg I-TEQ/m(2)-day) and 289-1010 pg/m(2)-day (0.540-1.94 pg WHO-TEQ/m(2)-day), respectively. The results showed that particle phase depositions dominated the dry deposition processes for the removal of PCDD/Fs and PCBs from the atmosphere, and the atmospheric deposition flux in the cold season tended to be higher than that during the warm season. The dry deposition velocity of individual PCDD/Fs (0.031-0.546 cm/s) increased as the number of chlorinated substitutes increased, which were similar to those measured or predicted in other Asian countries. Similar patterns of dry deposition velocities were observed for individual PCBs (0.069-3.38 cm/s), due to the fact that low chlorinated PCBs are predominant in gas phase and have lower deposition velocities.
Relation:	Aerosol And Air Quality Research, 12(5), 1016-1029
Appears in Collections:	[Dept. of Environmental Engineering and Science (including master's program)] Periodical Articles

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