Amezcua-Allieri Myriam A, Lead Jamie R, Rodríguez-Vázquez Refugio
Division of Environmental Health and Risk Management, School of Geography, Earth and Environmental Sciences, The University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK.
Biometals. 2005 Feb;18(1):23-9. doi: 10.1007/s10534-004-5771-y.
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.
多环芳烃导致的土壤污染通常与高含量潜在有毒金属的存在有关。生物修复是清理这类污染的重要选择。研究了在土壤中频繁青霉去除菲的过程中铬通量和浓度的变化。在生物修复过程中，通过薄膜扩散梯度技术（DGT）以及在灭菌和未灭菌土壤中的过滤来监测铬行为的变化。DGT提供了来自固相的通量的绝对数据以及最不稳定金属物种浓度的相对趋势。过滤提供了溶液相中铬浓度的数据。这些数据共同提供了有关金属物理和化学行为的信息。结果表明，在未灭菌土壤（其中包括本地微生物和频繁青霉接种物）中观察到最高的菲去除率，菲去除率为73±3.2%。然而，在所有情况下，微生物活动都会增加铬通量和土壤溶液中的铬浓度。频繁青霉对土壤的生物修复增加了土壤中铬的活性和迁移性，这可能对植物吸收以及金属进入人类食物链的增加产生影响。
