title: Uptake and depuration of PCB-153 in edible shrimp Palaemonetes varians and human health risk assessment.
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).
authors: CFE-Centre for Functional Ecology, Department of Life Sciences, University of Coimbra, PO-BOX 3046, 3001-401 Coimbra, Portugal. Electronic address: tgrilo@uc.pt.
authors: T F
authors: TF
authors: Grilo
authors: IMAR - CMA - Marine and Environmental Research Centre, Department of Life Sciences, University of Coimbra, 3004-517 Coimbra, Portugal.
authors: P G
authors: PG
authors: Cardoso
authors: Department of Chemistry & Center for Environmental and Marine Studies (CESAM), University of Aveiro, 3810-193 Aveiro, Portugal.
authors: P
authors: P
authors: Pato
authors: Department of Chemistry & Center for Environmental and Marine Studies (CESAM), University of Aveiro, 3810-193 Aveiro, Portugal.
authors: A C
authors: AC
authors: Duarte
authors: CFE-Centre for Functional Ecology, Department of Life Sciences, University of Coimbra, PO-BOX 3046, 3001-401 Coimbra, Portugal.
authors: M A
authors: MA
authors: Pardal
mesh_terms: D000818:Animals; D005506:Food Contamination / Q000032:analysis; D006801:Humans; D033541:Palaemonidae / Q000737:chemistry* / Q000378:metabolism*; D011078:Polychlorinated Biphenyls / Q000737:chemistry* / Q000378:metabolism*; D018570:Risk Assessment; D013995:Time; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000378:metabolism*
chemical_list: D014874:Water Pollutants, Chemical; D011078:Polychlorinated Biphenyls; C014024:2,4,5,2',4',5'-hexachlorobiphenyl
keywords: Bioaccumulation; Depuration; Food safety; Human health; PCB-153; Palaemonetes varians