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Title: Uptake and depuration of PCB-153 in edible shrimp Palaemonetes varians and human health risk assessment
Author: Grilo, T. F.
Cardoso, P. G.
Pato, P.
Duarte, A. C.
Pardal, M. A.
Keywords: Bioaccumulation
Food safety
Human health
Palaemonetes varians
Issue Date: 2014
Publisher: Elsevier
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 (0.25μgL-1), accumulation followed a saturation model, reaching an apparent steady state after fifteen days exposure. For intermediate (2.5μgL-1) and high PCB-153 levels (25μgL-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).
Peer review: yes
DOI: 10.1016/j.ecoenv.2013.12.020
ISSN: 0147-6513
Appears in Collections:CESAM - Artigos
DQ - Artigos

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