Uptake and depuration of PCB-153 in edible shrimp Palaemonetes varians and human health risk assessment.
Ecotoxicol Environ Saf
; 101: 97-102, 2014 Mar.
Article
in En
| MEDLINE
| ID: mdl-24507133
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).
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Water Pollutants, Chemical
/
Polychlorinated Biphenyls
/
Palaemonidae
Type of study:
Etiology_studies
/
Risk_factors_studies
Limits:
Animals
/
Humans
Language:
En
Journal:
Ecotoxicol Environ Saf
Year:
2014
Document type:
Article