The content and congener profiles of 17 PCDD/Fs were measured in an aquatic system in central Taiwan that included both aquatic animals and sediment. The total averaged mass content of PCDD/Fs was 0.432, 0.671, 0.244 and 0.727 pg g–1, and the corresponding total PCDD/Fs-WHO2005-TEQ were 0.070, 0.015, 0.024 and 0.018 pg WHO2005-TEQ g–1 in O. mossambica, M. meretrix, L. calcarifer and O. gigas, respectively. The total PCDD/Fs in the sediment in the coastal area (72.63 ng kg–1) was much higher than that in the fishponds (29.53 ng kg–1), but the corresponding WHO2005-TEQ values in the coastal area (0.545 ng WHO2005-TEQ kg–1) were lower than those in the fishponds (0.655 ng WHO2005-TEQ kg–1). The mass PCDD/F congener profiles of the aquatic animals and sediment samples in the fishponds and coastal area were dominated by more highly chlorinated PCDD/F congeners such as OCDD and OCDF, while the WHO2005-TEQ PCDD/F congener profiles were dominated by the less-chlorinated PCDD/F congeners such as 1,2,3,7,8-PeCDD and 2,3,4,7,8-PeCDF. Over a time periods ranging from 30 and 60 years, the modeled PCDD/F contents in the sediment ranged between 9.27 and 18.53 ng WHO2005-TEQ kg–1 in scenario A, and the PCDD/F contents ranged from 6.18–12.36 ng WHO2005-TEQ kg–1 in scenario B. Compared with the observed average values of sediment in this study, the ratios of the modeled and observed values ranged from 9.4–34.0.
All Science Journal Classification (ASJC) codes
- Environmental Chemistry