Uptake and depuration of PCB-153 in edible shrimp Palaemonetes varians and human health risk assessment

• Autor(a) principal: Grilo, T. F.
• Data de Publicação: 2014
• Outros Autores: Cardoso, P. G., Pato, P., Duarte, A. C., Pardal, M. A.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10316/25532; https://doi.org/10.1016/j.ecoenv.2013.12.020
• topic: Palaemonetes varians; PCB-153; Bioaccumulation; Depuration; Food safety; Human health

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 PCB153 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 L 1), accumulation followed a saturation model, reaching an apparent steady state after fifteen days exposure. For intermediate (2.5 μg L 1) and high PCB-153 levels (25 μg L 1), 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 72h 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 (75ngg 1 ww for Σ6 PCB).