A microcosm system and an analytical protocol to assess PAH degradation and metabolite formation in soils |
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Authors: | Lida Arias Jorge Bauzá Joana Tobella Joaquim Vila Magdalena Grifoll |
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Institution: | (1) Department of Microbiology, University of Barcelona, Diagonal 645, Barcelona, 08028, Spain;(2) Microbiology School, University of Antioquia, 67th street 53-108, Medellin, CA 1226, USA |
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Abstract: | During bioremediation of polycyclic aromatic hydrocarbon (PAH)-polluted soils accumulation of polar metabolites resulting
from the biological activity may occur. Since these polar metabolites are potentially more toxic than the parental products,
a better understanding of the processes involved in the production and fate of these oxidation products in soil is needed.
In the present work we describe the design and set-up of a static soil microcosm system and an analytical methodology for
detection of PAHs and their oxidation products in soils. When applied to a soil contaminated with phenanthrene, as a model
PAH, and 1-hydroxy-2-naphthoic acid, diphenic acid, and phthalic acid as putative metabolites, the extraction and fractionation
procedures resulted in recoveries of 93%, 89%, 100%, and 89%, respectively. The application of the standardized system to
study the biodegradation of phenanthrene in an agricultural soil with and without inoculation of the high molecular weight
PAH-degrading strain Mycobacterium sp. AP1, demonstrates its suitability for determining the environmental fate of PAHs in polluted soils and for evaluating
the effect of bioremediative treatments. In inoculated microcosms 35% of the added phenanthrene was depleted, 19% being recovered
as CO2 and 3% as diphenic acid. The latter, together with other two unidentified metabolites, accumulated in soil. |
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Keywords: | Biodegradation Polycyclic aromatic hydrocarbons Soil microcosms Phenanthrene Bacterial PAH metabolites |
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