Contreras-Ramos Silvia M, Alvarez-Bernal Dioselina, Dendooven Luc
Laboratory of Soil Ecology, Department of Biotechnology and Bioengineering, Cinvestav, Av. Instituto Politécnico Nacional 2508, C.P. 07000 México, D.F., Mexico.
Environ Pollut. 2006 Jun;141(3):396-401. doi: 10.1016/j.envpol.2005.08.057. Epub 2005 Nov 2.
The removal of phenanthrene, anthracene and benzo(a)pyrene added at three different concentrations was investigated with or without earthworms (Eisenia fetida) within 11 weeks. Average anthracene removal by the autochthonous micro-organisms was 23%, 77% for phenanthrene and 13% for benzo(a)pyrene, while it was 51% for anthracene, 47% for benzo(a)pyrene and 100% for phenanthrene in soil with earthworms. At 50 and 100mg phenanthrene kg(-1)E. fetida survival was 91% and 83%, but at 150 mg kg(-1) all died within 15 days. Survival of E. fetida in soil amended with anthracene < or = 1000 mg kg(-1) and benzo(a)pyrene < or = 150 mg kg(-1) was higher than 80% and without weight loss compared to the untreated soil. Only small amounts of PAHs were detected in the earthworms. It was concluded that E. fetida has the potential to remove large amounts of PAHs from soil, but more work is necessary to elucidate the mechanisms involved.
在11周内，研究了添加三种不同浓度菲、蒽和苯并(a)芘的土壤在有或没有蚯蚓（赤子爱胜蚓）情况下这些物质的去除情况。土壤中本地微生物对蒽的平均去除率为23%，对菲为77%，对苯并(a)芘为13%；而在有蚯蚓的土壤中，蒽的去除率为51%，苯并(a)芘为47%，菲为100%。在菲浓度为50和100mg/kg时，赤子爱胜蚓的存活率分别为91%和83%，但在150mg/kg时，所有蚯蚓在15天内全部死亡。在添加蒽≤1000mg/kg和苯并(a)芘≤150mg/kg的土壤中，赤子爱胜蚓的存活率高于80%，且与未处理土壤相比体重没有减轻。在蚯蚓体内仅检测到少量多环芳烃。得出的结论是，赤子爱胜蚓有从土壤中去除大量多环芳烃的潜力，但需要更多工作来阐明其中涉及的机制。
