Dioxin transfer from sediment to the infaunal surface deposit-feeding polychaete Perinereis nuntia in a laboratory-rearing experiment
✍ Scribed by Kumiko Kono; Hiroyuki Tanaka; Jiro Koyama
- Book ID
- 102194275
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 182 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0730-7268
- DOI
- 10.1002/etc.177
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✦ Synopsis
In the presented study a laboratory experiment was conducted to investigate the transfer of polychlorinated dibenzo-pdioxins (PCDDs), polychlorinated dibenzofurans (PCDFs), and dioxin-like polychlorinated biphenyls (PCBs) from environmentally contaminated marine sediment to an infaunal surface deposit-feeding polychaete, Perinereis nuntia. Polychaetes were exposed to contaminated sediment for 42 d, and elimination of these compounds was studied for an additional 28 d. The sediment uptake rate coefficients (k s ), elimination rate constants (k 2 ), and the biota-sediment accumulation factors (BSAFs) were determined for PCDDs, PCDFs (PCDD/Fs), and dioxin-like PCBs. Each of these compounds was transferred from sediment to polychaete except for hepta-and octachlorinated PCDD/Fs. The BSAFs for dioxin-like PCBs (0.13-2.2) were significantly higher than those for PCDD/Fs (0.00022-0.36). The BSAF, k s , and k 2 values obtained in the present study indicate that the bioaccumulation characteristics of PCDD/Fs in polychaete are similar to those in fish, and depend on their physical and chemical properties such as hydrophobicity and size of molecules. The k s values for PCDD/Fs and dioxin-like PCBs declined with an increase in their log K OW values, indicating a decrease in bioavailability. The negative exponential relationships of k 2 versus K OW were observed for these compounds. The slope for the lognormalized regression of k 2 versus K OW for the PCDD/Fs was smaller than that for the dioxin-like PCBs and that of k s versus K OW for the PCDD/Fs. Therefore, the negative exponential relationship of BSAF versus K OW was observed for PCDD/Fs, but not for dioxin-like PCBs.