Bioconcentration of Ag, Cd, Co, Mn and Zn in the Mangrove Oyster (Crassostrea gasar) and Preliminary Human Health Risk Assessment: A Radiotracer Study

  • Harriet Kuranchie-Mensah
  • Jean-Louis Teyssié
  • François Oberhänsli
  • Yutthana Tumnoi
  • Simon Pouil
  • Michel Warnau
  • Marc Metian
Article
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Abstract

Bioaccumulation kinetics of five dissolved metals were determined in the mangrove oyster Crassostrea gasar, using corresponding radiotracers (54Mn, 57Co, 65Zn, 109Cd and 110mAg). Additionally, their bioaccessibility to human consumers was estimated. Results indicated that over a 14-day exposure 54Mn and 57Co were linearly concentrated in oysters whereas 109Cd, 65Zn and 110mAg were starting to saturate (steady-state not reached). Whole-body concentration factors at 14 days (CF14d in toto) ranged from 187 ± 65 to 629 ± 179 with the lowest bioconcentration capacity for Co and the highest for Ag. Depuration kinetics were best described by a double-exponential model with associated biological half-lives ranging from 26 days (Ag) to almost 8 months (Zn and Cd). Bioaccessible fraction of the studied elements was estimated using in vitro digestions, which suggested that oysters consumed seasoned with lemon enhanced the accessibility of Cd, Mn and Zn to human consumers, but not Ag and Co.

Keywords

Metals Bioaccumulation Tropical African bivalve Seafood safety 
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Notes

Acknowledgments

The IAEA is grateful to the Government of the Principality of Monaco for the support provided to its Environment Laboratories. MW is an Honorary Senior Research Associate of the National Fund for Scientific Research (NFSR, Belgium). Authors are grateful to Dr. S. Ouffoue (Côte d’Ivoire) for his support in collection and shipment of oysters.

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  • Harriet Kuranchie-Mensah
    • 1
    • 2
  • Jean-Louis Teyssié
    • 1
  • François Oberhänsli
    • 1
  • Yutthana Tumnoi
    • 3
  • Simon Pouil
    • 1
  • Michel Warnau
    • 1
  • Marc Metian
    • 1
  1. 1.Radioecology LaboratoryInternational Atomic Energy Agency - Environment Laboratories (IAEA-EL)MonacoPrincipality of Monaco
  2. 2.Nuclear Chemistry and Environmental Research Centre, National Nuclear Research InstituteGhana Atomic Energy CommissionLegon, AccraGhana
  3. 3.Bureau of Technical Support for Safety RegulationOffice of Atoms for PeaceChatuchak, BangkokThailand

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