title: Assessment of contaminated sediments with an indoor freshwater/sediment microcosm assay.
abstract: This study was conducted to assess the feasibility of using a 2-L, indoor microcosm assay to evaluate five contaminated sediments (A, B, C, D, and E). Toxic potential was deduced in the light of general contamination of sediments, pollutant partitioning in microcosms, and biological responses of species (Pseudokirchneriella subcapitata, Lemna minor, Daphnia magna, Hyalella azteca, Chironomus riparius): E > A > B > C > D. Sediments mainly were contaminated by metals (lead and zinc). Organic pollutant contents varied among the sediments. The major polycyclic aromatic hydrocarbon (PAH) compounds were pyrene, fluoranthene, and phenanthrene. Sediments A, B, and C highly stimulated duckweed growth (> 700%) and impaired daphnid (< 20%) and amphipod survival (< 30%). Sediment D had no significant effect on pelagic and benthic organisms. Finally, sediment E, the most toxic, limited duckweed growth (inhibition of 82%) and impaired daphnid survival (0% of survival). Amphipods were impaired dramatically by this sediment (0% of survival), in contrast with chironomids, for which no toxic effect was measured. The 2-L, indoor microcosm assay successfully was applied to the assessment of those five contaminated sediments. Sediments A, B, C, and E should not be deposited in gravel quarries, and new, more sensitive endpoint measurements should be developed.
authors.affiliation: Laboratoire des Sciences de l'Environnement, Ecole Nationale des Travaux Publics de I'Etat, Rue Maurice Audin, 69518 Vaulx-en-Velin Cedex, France. gaelle.triffaultbouchet@menv.gouv.qc.ca
authors.forename: Gaëlle
authors.initials: G
authors.lastname: Triffault-Bouchet
authors.forename: Bernard
authors.initials: B
authors.lastname: Clément
authors.forename: Gérard
authors.initials: G
authors.lastname: Blake
mesh_terms: D000818:Animals; D002683:Chironomidae / Q000378:metabolism*; D003621:Daphnia; D004784:Environmental Monitoring / Q000379:methods*; D004785:Environmental Pollutants; D005449:Fluorenes / Q000032:analysis; D005618:Fresh Water; D019015:Geologic Sediments / Q000032:analysis*; D006863:Hydrogen-Ion Concentration; D008670:Metals / Q000737:chemistry; D009930:Organic Chemicals; D010616:Phenanthrenes / Q000032:analysis; D011084:Polycyclic Aromatic Hydrocarbons / Q000032:analysis; D011721:Pyrenes / Q000032:analysis; D012680:Sensitivity and Specificity; D012989:Soil Pollutants; D013696:Temperature; D013997:Time Factors; D014867:Water / Q000737:chemistry; D014873:Water Pollutants; D014874:Water Pollutants, Chemical; D015048:Zooplankton / Q000378:metabolism
chemical_list: D004785:Environmental Pollutants; D005449:Fluorenes; D008670:Metals; D009930:Organic Chemicals; D010616:Phenanthrenes; D011084:Polycyclic Aromatic Hydrocarbons; D011721:Pyrenes; D012989:Soil Pollutants; D014873:Water Pollutants; D014874:Water Pollutants, Chemical; D014867:Water; C007738:fluoranthene; C031181:phenanthrene; C030984:pyrene