Evaluating the role of desorption in bioavailability of sediment-associated contaminants using oligochaetes, semipermeable membrane devices and Tenax extraction

University of Joensuu, Department of Biology, Yliopistokatu 7, FIN-80100 Joensuu, Finland.
Environmental Pollution (Impact Factor: 4.14). 04/2006; 140(1):150-63. DOI: 10.1016/j.envpol.2005.06.010
Source: PubMed


The success of the rapidly desorbing fraction as an available fraction was challenged by using sediment ingesting and non-ingesting oligochaetes (Lumbriculus variegatus) together with passive samplers (semipermeable membrane devices, SPMDs) in accumulation and kinetic modelling exercises for carbon-14 labelled model compounds (pyrene, benzo[a]pyrene and 3,4,3',4'-tetrachlorobiphenyl). Passive samplers clearly produced lower uptake rate constants and steady state factors than either of the oligochaete treatments when residue concentrations were based on animal lipid or total SPMD weight. The rapidly desorbing chemical fractions in sediments did not show a significant relationship with the biota sediment accumulation factors or SPMD accumulation factors. A distinctly better relationship was observed between the accumulation factors and the desorption rate constants. The results support the assumption that desorption plays an important role in bioavailability, although animal behaviour and the diffusional limitations of hydrophobic contaminants in sediment together probably affect the actual available pool.

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    • "In particular such devices have been combined with specific in vitro bioassays for an integrative characterization of the contamination (Vermeirssen et al. 2005, Creusot et al. 2010, David et al. 2010, Harman et al. 2010). Moreover, in addition to surface water application, the use of passive sampling to assess bioavailable organic contaminants in sediments have been recently reported for more realistic risk characterization of environmental mixtures (Brack et al. 2009, Leppanen et Kukkonen 2006). The aim of this study was to assess spatial and temporal distribution of EDCs activities (estrogenic, anti-androgenic, PXR-like and dioxin-like) between sediment and surface water in order to highlight the source and fate of active chemicals. "
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    • "Due to the fact, that L. variegatus unselectively ingests fine sediment particles (Kukkonen and Landrum, 1995), there is a high potential of ingesting toxic substances. For this species, the ingestion of particle-bound chemicals can be an important accumulation route of hydrophobic contaminants (Leppanen and Kukkonen, 2006). The uptake of these contaminants requires their bioavailability and depends on various factors like pH, humic acid and dissolved organic carbon content (Nikkila et al., 2003). "
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