Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
4382404 | Applied Soil Ecology | 2013 | 8 Pages |
Abstract
The endogeic earthworm Pontoscolex corethrurus (Müller, 1857) was the most abundant species (75%) in soil contaminated with hydrocarbons, mostly benzo(a)pyrene (BaP), in the state of Tabasco (Mexico). The earthworm P. corethrurus was tested for its capacity to remove 100 mg BaP kgâ1 from an Anthrosol soil (sterilized or not) and amended with legume Mucuna pruriens (L.) DC. var. utilis (Wall. ex Wight) Baker ex Burck (3%) or the grass Brachiaria humidicola (L.) DC (3%) (recently renamed as Urochloa humidicola (Rendle) Morrone & Zuloaga) in an aerobic incubation experiment. P. corethrurus removed 26.6 mg BaP kgâ1 from the sterilized soil and application of B. humidicola as feed increased this to 35.7 mg BaP kgâ1 and M. pruriens to 34.2 mg BaP kgâ1 after 112 days. The autochthonous microorganisms removed 9.1 mg BaP kgâ1 from the unsterilized soil and application of B. humidicola increased this to 18.0 mg BaP kgâ1 and M. pruriens to 11.2 mg BaP kgâ1. Adding P. corethrurus to the unsterilized soil accelerated the removal of BaP and 36.1 mg kgâ1 was dissipated from soil. It was found that the autochthonous microorganisms removed BaP from soil, but addition of P. corethrurus increased the dissipation 4-fold. The endogeic earthworm P. corethrurus can thus be used to remediate hydrocarbon-contaminated soils in tropical regions.
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Authors
B. Hernández-Castellanos, A. OrtÃz-Ceballos, S. MartÃnez-Hernández, J.C. Noa-Carrazana, M. Luna-Guido, L. Dendooven, S.M. Contreras-Ramos,