Receptor modeling for analyzing PCDD/F and dioxin-like PCB sources in Hong Kong |
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Authors: | Xiao Ling Peng Maggie Pik Kwan Choi Ming Hung Wong |
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Institution: | (1) Croucher Institute for Environmental Sciences and Department of Biology, Hong Kong Baptist University, Hong Kong, People’s Republic of China;(2) Department of Mathematics, Shanghai Jiaotong University, Shanghai, China |
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Abstract: | A total of 96 ambient air samples were collected from January 2004 to December 2004 for the investigation of dioxins (polychlorinated
dibenzo-para-dioxins and polychlorinated dibenzofurans PCDD/Fs]) and dioxin-like profile for polychlorinated biphenyls (PCBs) in the
atmosphere of Hong Kong. Two-day back-trajectories were obtained using the Hybrid Single-Particle Lagrangian Integrated Trajectory
(HYSPLIT) model from National Oceanic and Atmospheric Administration (NOAA) Air Resources Laboratory. Receptor models – potential
source contribution function (PSCF) and concentration-weighted trajectory (CWT) – were built based on the measured PCDD/Fs
and dioxin-like PCBs total toxic equivalent (TEQ) concentrations. Both models were modified in this study so as to integrate
the information obtained from three sampling sites in Hong Kong. The PSCF modeling resolved two main PCDD/F and dioxin-like
PCB polluting paths from Mainland China. In line with previous studies, the northerly path around the Pearl River Delta might
be one of the pollution sources of Hong Kong air. On the other hand, the receptor models also indicated another potential
northeasterly source from Yangtze River Delta, which was seldom mentioned as the source region of Hong Kong air. Results from
the CWT modeling suggested that the most toxic air mass affecting Hong Kong is probably attributable to the northeast path
rather than the north path. |
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Keywords: | back-trajectory dioxin-like PCBs PCDD/Fs receptor modeling |
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