Changes of chromium behavior in soil during phenanthrene removal by <Emphasis Type="Italic">Penicillium frequentans</Emphasis> |
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Authors: | Myriam A Amezcua-Allieri Jamie R Lead Refugio Rodríguez-Vázquez |
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Institution: | (1) Division of Environmental Health and Risk Management, School of Geography, Earth and Environmental Sciences, The University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK;(2) Department of Biotechnology and Bioengineering, CINVESTAV-IPN, Av. IPN 2508, San Pedro Zacatenco, 07360, Mexico |
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Abstract: | Soil contamination due to polycyclic aromatic hydrocarbons is often associated with the presence of high levels of potentially
toxic metals. Bioremediation is an important option for the clean up of this type of contamination. Changes of chromium fluxes
and concentrations during the phenanthrene removal by Penicillium frequentans in soil were investigated. During the bioremediation process, changes in chromium behavior were monitored by Diffusive Gradients
in Thin-films (DGT) and by filtration in both sterilized and non-sterilized soils. DGT provided absolute data on fluxes from
the solid phase and relative trends of concentrations of the most labile metal species. Filtration provided data on the concentrations
of Cr in the solution phase. Together the data provided information about the physical and chemical metal behavior. Results
showed that the highest phenanthrene removal was observed in non-sterilized soil (which included the autochthonous microorganisms
and P. frequentans inoculum), with a phenanthrene removal of 73 ± 3.2%. However, in all cases microbial activity increased chromium fluxes and
chromium soil solution concentration. The bioremediation of soil by P. frequentans increased the lability and mobility of chromium in soil, with potential consequences for plant uptake and for increased movement
of metals into the human food chain.
Published online December 2004 |
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Keywords: | Cr DGT P frequentans PAHs phenanthrene solid-state culture |
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