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Metal fluxes from porewaters and labile sediment phases for predicting metal exposure and bioaccumulation in benthic invertebrates

Journal Article


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Abstract


  • The use of diffusive gradients in thin films (DGT) for predicting metal bioavailability was investigated by exposing the bivalve Tellina deltoidalis to an identical series of metal-contaminated sediments deployed simultaneously in the field and laboratory. To understand the differences in metal exposure occurring between laboratory and field-based bioassays, changes in metal fluxes to DGT probes in sediments, and metal concentrations and partitioning to porewaters and overlying waters were investigated. DGT-metal fluxes (Cu, Pb and Zn) were lower in the overlying waters of most field-bioassays compared to the laboratory, causing differences in Pb and Zn bioaccumulation between bivalves exposed to laboratory and field conditions. Overall, DGT-metal fluxes provided predictions of metal bioaccumulation similar to those obtained using dilute-acid extractable metal measurements. This study demonstrates that, irrespective of the physicochemical properties of the sediment and type of exposure (laboratory or field), sediments pose a significant risk of bioaccumulation by T. deltoidalis when the Cu, Pb and Zn DGT flux exceeds 3.5, 1.3 and 156 µg/h/m2, respectively. The results presented here support the use of the DGT technique for sediment quality assessment and the hypothesis that DGT-metal fluxes may potentially be useful surrogates for the lability of metals for all exposure routes.

Authors


  •   Amato, Elvio D. (external author)
  •   Simpson, Stuart L. (external author)
  •   Belzunce-Segarra, María (external author)
  •   Jarolimek, Chad V. (external author)
  •   Jolley, Dianne F.

Publication Date


  • 2015

Citation


  • Amato, E. D., Simpson, S. L., Belzunce-Segarra, M. J., Jarolimek, C. V. & Jolley, D. F. (2015). Metal fluxes from porewaters and labile sediment phases for predicting metal exposure and bioaccumulation in benthic invertebrates. Environmental Science and Technology (Washington), 49 (24), 14204-14212.

Scopus Eid


  • 2-s2.0-84950118422

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=4390&context=smhpapers

Ro Metadata Url


  • http://ro.uow.edu.au/smhpapers/3367

Number Of Pages


  • 8

Start Page


  • 14204

End Page


  • 14212

Volume


  • 49

Issue


  • 24

Abstract


  • The use of diffusive gradients in thin films (DGT) for predicting metal bioavailability was investigated by exposing the bivalve Tellina deltoidalis to an identical series of metal-contaminated sediments deployed simultaneously in the field and laboratory. To understand the differences in metal exposure occurring between laboratory and field-based bioassays, changes in metal fluxes to DGT probes in sediments, and metal concentrations and partitioning to porewaters and overlying waters were investigated. DGT-metal fluxes (Cu, Pb and Zn) were lower in the overlying waters of most field-bioassays compared to the laboratory, causing differences in Pb and Zn bioaccumulation between bivalves exposed to laboratory and field conditions. Overall, DGT-metal fluxes provided predictions of metal bioaccumulation similar to those obtained using dilute-acid extractable metal measurements. This study demonstrates that, irrespective of the physicochemical properties of the sediment and type of exposure (laboratory or field), sediments pose a significant risk of bioaccumulation by T. deltoidalis when the Cu, Pb and Zn DGT flux exceeds 3.5, 1.3 and 156 µg/h/m2, respectively. The results presented here support the use of the DGT technique for sediment quality assessment and the hypothesis that DGT-metal fluxes may potentially be useful surrogates for the lability of metals for all exposure routes.

Authors


  •   Amato, Elvio D. (external author)
  •   Simpson, Stuart L. (external author)
  •   Belzunce-Segarra, María (external author)
  •   Jarolimek, Chad V. (external author)
  •   Jolley, Dianne F.

Publication Date


  • 2015

Citation


  • Amato, E. D., Simpson, S. L., Belzunce-Segarra, M. J., Jarolimek, C. V. & Jolley, D. F. (2015). Metal fluxes from porewaters and labile sediment phases for predicting metal exposure and bioaccumulation in benthic invertebrates. Environmental Science and Technology (Washington), 49 (24), 14204-14212.

Scopus Eid


  • 2-s2.0-84950118422

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=4390&context=smhpapers

Ro Metadata Url


  • http://ro.uow.edu.au/smhpapers/3367

Number Of Pages


  • 8

Start Page


  • 14204

End Page


  • 14212

Volume


  • 49

Issue


  • 24