Contributions of dry and wet depositions of polychlorinated dibenzo-p-dioxins and dibenzofurans to a contaminated site resulting from a penetachlorophenol manufacturing process |
| |
Authors: | Hwang J Chang Shizoom Wang Ya F Wang Hsing W Li Lin C Wang |
| |
Institution: | 1. Department of Environmental Engineering, National Chung Hsing University, 250 Kuo-kuang Road, Taichung, 402, Taiwan 2. Department of Bioenvironmental Engineering, Chung Yuan Christian University, 200 Chung-Pei Road, Chung-Li, 320, Taiwan 3. Department of Environmental Engineering, National Cheng Kung University, Tainan, 701, Taiwan 4. Sustainable Environmental Research Center, National Cheng Kung University, Tainan, 701, Taiwan 5. Department of Chemical and Materials Engineering, Cheng Shiu University, Kaohsiung, 833, Taiwan
|
| |
Abstract: | The soils at a factory for manufacturing pentachlorophenol were heavily contaminated by polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs). In order to verify the contributions of dry and wet deposition of PCDD/Fs from the ambient air, the concentration of PCDD/Fs in ambient air and soil were measured, the partition of particle- and gas-phases of atmospheric PCDD/Fs was calculated, and the annual fluxes of total dry and wet PCDD/F depositions were modeled. Average atmospheric PCDD/F concentration was 1.24 ng Nm???3 (or 0.0397 ng I-TEQ Nm???3). Moreover, over 92.8% of total PCDD/Fs were in the particle phase, and the dominant species were high chlorinated congeners. The total PCDD/F fluxes of dry and wet deposition were 119.5 ng m???2 year???1 (1.34 ng I-TEQ m???2 year???1) and 82.0 ng m???2 year???1 (1.07 ng I-TEQ m???2 year???1), respectively. By scenario simulation, the total fluxes of dry and wet PCDD/F depositions were 87.1 and 68.6 ng I-TEQ, respectively. However, the estimated PCDD/F contents in the contaminated soil were 839.9 ?? g I-TEQ. Hence, the contributions of total depositions of atmospheric PCDD/F were only 0.02%. The results indicated that the major sources of PCDD/F for the contaminated soil could be attributed to the pentachlorophenol manufacturing process. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|