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- W16204657 abstract "Traditional sediment quality assessments relied on quantifying the “total” contaminant concentrations, however, there is increasing awareness that the “total” contaminant concentrations (measured by exhaustive extraction with organic solvents) are not representative for the actual risks of ecotoxicological effects and contaminant transport to groundwater and surface water. Alternatively, bioavailable fraction quantified by polymer-based non-depletive equilibrium passive sampling methods (e.g., polydimethylsiloxane (PDMS)) and bioaccessible fraction obtained by depletive but non-exhaustive extraction techniques (e.g., Tenax) have been considered as better dose metric for sediment quality assessment. In this study we collected surface sediment samples in South East Queensland ranging from a pristine environment to urban and industrial impacted areas. The “total”, bioavailable and bioaccessible fractions were subjected to a battery of cell-based in vitro bioassays to study the mixture effects present in the sediments. Toxic effects were expressed as bioanalytical equivalent concentrations (BEQs). Our results showed that BEQs from the exhaustive extraction after organic carbon (OC) normalization agreed fairly well with the bioavailable fraction obtained from PDMS after normalizing the BEQs with the chemical-independent and constant OC-polymer partition coefficient. Agreement was best for bioassays related to herbicide activity and oxidative stress response. BEQs from exhaustive extractions were 2 – 3 times higher than PDMS extracts for the induction of Ah-receptor indicating that most of the dioxin-like or PAH chemicals were not readily bioavailable. For the non-specific toxicity endpoint quantified with the bioluminescence inhibition assay Microtox, exhaustive extraction has BEQs 10 times higher than PDMS, possibly an experimental artifact caused by co-extraction of bioactive natural organic matter. Lastly for the bioaccessible fraction of Tenax extracts the BEQs showed similar trend of the exhaustive extracts, however, this extraction method is only operationally defined." @default.
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- W16204657 date "2013-01-01" @default.
- W16204657 modified "2023-09-24" @default.
- W16204657 title "Chemical pollution in sediments – buried forever? Bioanalytical characterization of total and bioavailable organic micropollutans for asessing sediment quality" @default.
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