Abstract
The wet deposition flux increased with stronger rainfall intensity. From the congener profiles of PCDD/F and PCB WHO-TEQ2005 total deposition fluxes, 2,3,4,7,8-PeCDF, 2,3,4,6,7,8-HxCDF, 1,2,3,4,7,8-HxCDF and 1,2,3,7,8-PeCDD dominate the deposition fluxes. PCB-126 and PCB169 are the two most significant congeners that dominate the PCB WHO-TEQ2005. The simulated results show that the monthly PCDD/F and PCB wet deposition fluxes during 2012 were in the range of 9.26–265 pg WHO-TEQ2005/m2-month and 0.205–9.38 pg WHO-TEQ/m2-month, respectively. The monthly PCDD/F and PCB wet deposition fluxes during 2013 were 0.152–211 pg WHO-TEQ2005/m2-month and 0.00823–6.84 pg WHO-TEQ/m2-month, respectively. Wet deposition mainly occurs in the high rainfall intensity seasons, such as summer. The simulated results indicate that wet deposition is dominated by the particulate phase. Regarding the annual PCDD/F and PCB total (dry + wet) WHO-TEQ2005 deposition fluxes, dry deposition fluxes account for 68.0–73.9%. Among these, PCDD/Fs dominate the total deposition (95.9–96.1%) and PCBs contribute only 3.9–4.1%. The average total PCDD/F and PCB-TEQ2005 deposition (dry + wet) flux in winter (317–429 pg WHO-TEQ/m2-month) was 1.46–2.63 times higher than that in summer (163–216 pg WHO-TEQ/m2-month).
Highlights
PCDD/Fs and PCBs were thought to be incriminated as a result of their potentials as estrogenic and anti-estrogenic disruptors (Canapa et al, 2002) and neuroendocrine effect by consumption of contaminated fish, meat products and via general environmental exposures (Kodavanti and Curras-Collazo, 2010)
Wet Deposition of PCDD/Fs and PCBs Wet deposition is the combination of vapor-phase and particle-bound SVOCs that are removed from the atmosphere by rain
The results show that wet deposition fluxes of PCDD/Fs are dominated by particle phase, and the same trend present in the wet deposition of PCBs
Summary
PCDD/Fs and PCBs were thought to be incriminated as a result of their potentials as estrogenic and anti-estrogenic disruptors (Canapa et al, 2002) and neuroendocrine effect by consumption of contaminated fish, meat products and via general environmental exposures (Kodavanti and Curras-Collazo, 2010). The cycle of PCDD/Fs and PCBs. A recent surge of research on PCDD/Fs and PCBs has given us new information and challenges in Asia (Lin et al, 2014; Wang et al, 2014). This study (that is, the part II.) focuses on modeling the characteristics of PCDD/F and PCB in the atmosphere of southern Taiwan. Aerosol and Air Quality Research, 14: 1966–1985, 2014 concentrations of PCDD/F and PCB could be determined through PM10 concentrations. Gaseous and particulate concentrations were both obtained by means of simulation. The simulated results from this study could provide helpful information to build up more complete inventory for understanding the level of PCDD/Fs and PCBs near Tainan city, or formulating stricter regulations about PCDD/Fs and PCBs
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