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Download fileMetal Fluxes from Porewaters and Labile Sediment Phases for Predicting Metal Exposure and Bioaccumulation in Benthic Invertebrates
journal contribution
posted on 15.12.2015, 00:00 authored by Elvio
D. Amato, Stuart L. Simpson, Maria J. Belzunce-Segarra, Chad V. Jarolimek, Dianne F. JolleyThe
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, we investigated changes in metal fluxes
to DGT probes in sediments and in metal concentrations and partitioning
to porewaters and overlying waters. 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.
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Keywords
metal FluxesMetal Exposurefield conditionsmetal bioaccumulationmetal bioavailabilitydiffusive gradientsDGT techniquePblaboratorymetal exposurefield bioassaysexposure routesmetal concentrationssediment quality assessmentZn DGT fluxLabile Sediment PhasesBenthic InvertebratesThe useDGT probesbivalve Tellina deltoidalisphysicochemical propertiesmetal fluxesZn bioaccumulation