Botton Sabrina, Parsons John R
Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Nieuwe Achtergracht 166, 1018 WV Amsterdam, The Netherlands.
Environ Toxicol Chem. 2006 Oct;25(10):2630-8. doi: 10.1897/06-004r.1.
The potential for benzene, toluene, ethylbenzene, and xylenes (BTEX) degradation was investigated in microcosms inoculated with sediment and groundwater from a polluted iron-reducing aquifer. Benzene, toluene, and each of the three xylene isomers were degraded by the intrinsic microorganisms under iron-reducing conditions, but there was no removal of ethylbenzene. This work provides the first evidence for para-xylene degradation by dissimilatory iron-reducing bacteria. Microcosms adapted to benzene, toluene, or m-xylene were subsequently exposed to a different BTEX compound, which was degraded without lag phase, suggesting that the same group of bacteria could be involved in the removal of more than one BTEX compound. Furthermore, when microcosms were exposed to a mixture of BTEX, concurrent degradation of benzene and toluene, but not of meta-xylene and ethylbenzene, was observed. These results suggest that, under the influence of the plume of pollution, an iron-reducing microbial community able to degrade multiple aromatic compounds has developed.
在接种了受污染的铁还原含水层沉积物和地下水的微观世界中，研究了苯、甲苯、乙苯和二甲苯（BTEX）的降解潜力。在铁还原条件下，苯、甲苯以及三种二甲苯异构体均被原生微生物降解，但乙苯未被去除。这项工作首次提供了异化铁还原细菌降解对二甲苯的证据。随后，将适应苯、甲苯或间二甲苯的微观世界暴露于不同的BTEX化合物中，该化合物无延迟期地被降解，这表明同一组细菌可能参与去除不止一种BTEX化合物。此外，当微观世界暴露于BTEX混合物时，观察到苯和甲苯同时降解，但间二甲苯和乙苯未同时降解。这些结果表明，在污染羽流的影响下，已形成了一个能够降解多种芳香化合物的铁还原微生物群落。
