Exposure of the marine deposit feeder Hydrobia ulvae to sediment associated LAS
2010
Mauffret, A. | Rico-Rico, Ángeles | Temara, A. | Blasco, Julián
7 páginas, 4 figuras, 4 tablas.
Show more [+] Less [-]Linear Alkylbenzene Sulfonates (LAS) effects (mortality, egestion rate, behaviour) on the marine deposit feeder Hydrobia ulvae were assessed in whole-sediment and water-only systems. The results were combined with a bioenergetic-based kinetic model of exposure pathways to account for the observed toxicity. The 10-d LC50 value based on the freely dissolved fraction was 9.3 times lower in spiked sediment (0.152 ± 0.001 (95% CI) mg/L) than in water-only (1.390 ± 0.020 (95% CI) mg/L). Consequently, the actual 10-d LC50 value (208 mg/kg) was overestimated by the Equilibrium Partitioning calculation (1629 mg/kg). This suggests that the sediment associated LAS fraction was bioavailable to the snails. It could also be due to modifications in physiological parameters in absence of sediment, the organism natural substrate.
Show more [+] Less [-]This research was supported by the European Commission through the FP6 program (EST Marie Curie Fellowship) and it was performed in the framework of the RISICO project (MEST-CT-2004-505182). We also acknowledge the financial support of ERASM, ECOSOL and PETRESA.
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