Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4420234 | Ecotoxicology and Environmental Safety | 2014 | 6 Pages |
Abstract
A medium-term mesocosm exposure study was conducted to elucidate bioaccumulation and depuration of polychlorinated biphenyl congener 153 (PCB-153) in edible shrimp Palaemonetes varians. Over the 15-day exposure period, shrimp under different exposure concentrations exhibited a significant increase in PCB-153 concentration compared with control organisms. Distinct bioaccumulation patterns and uptake rates were observed depending on the exposure concentrations. For low PCB-153 exposure levels (0.25 μg Lâ1), accumulation followed a saturation model, reaching an apparent steady state after fifteen days exposure. For intermediate (2.5 μg Lâ1) and high PCB-153 levels (25 μg Lâ1), accumulation was faster and linear. In addition, the bioaccumulation rate was not proportional to PCB-153 concentration, and the bioaccumulation was higher at intermediate exposure concentrations. Regarding the depuration phase, P. varians lost up to 30% of PCB-153 after 72 h and levels continued slowly to decrease until the end of the 30-d experimental period. However, PCB-153 levels in shrimp did not reach background values, and those exposed to moderate and high PCB-153 concentrations presented contamination levels much higher than the regulatory limit for human food consumption (75 ng gâ1 ww for Σ6 PCB).
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Authors
T.F. Grilo, P.G. Cardoso, P. Pato, A.C. Duarte, M.A. Pardal,