Assessing the effects of FBC ash treatments of metal-contaminated soils using life history traits and metal bioaccumulation analysis of the earthworm Eisenia andrei.
Earthworms (Eisenia andrei) were exposed, in controlled conditions, to metal-contaminated soils previously treated in situ with two types of fluidized bed combustion ashes. Effects on this species were determined by life history traits analysis. Metal immobilizing efficiency of ashes was indicated by metal bioaccumulation. Ashes-treated soils reduced worm mortality compared to the untreated soil. However, these ashes reduced both cocoon hatching success and hatchlings numbers compared to the untreated soil. In addition, sulfo-calcical ashes reduced or delayed worm maturity and lowered cocoon production compared to silico-alumineous ones. Metal immobilizing efficiency of ashes was demonstrated for Zn, Cu and to a lesser extent Pb. Only silico-alumineous ashes reduced Cd bioaccumulation, although Cd was still bioconcentrated. Thus, although ash additions to metal-contaminated soils may help in immobilizing metals, their use might result, depending on the chemical nature of ashes, to severe detrimental effects on earthworm reproduction with possible long term consequences to populations.
Grumiaux
Fabien
F
Université Lille Nord de France, LGCgE-Ecologie Numérique et Ecotoxicologie-Lille1, Bât. SN3, 59655 Villeneuve d'Ascq Cedex, France. fabien.grumiaux@univ-lille1.fr
Demuynck
Sylvain
S
Schikorski
David
D
Lemière
Sébastien
S
Leprêtre
Alain
A
D000818:Animals; D052918:Environmental Restoration and Remediation / Q000379:methods*; D017745:Incineration; D008670:Metals / Q000737:chemistry* / Q000378:metabolism / Q000633:toxicity; D009835:Oligochaeta / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism*; D012989:Soil Pollutants / Q000737:chemistry* / Q000378:metabolism / Q000633:toxicity
D008670:Metals; D012989:Soil Pollutants