Swiss Federal Institute for Water Resources and Water Pollution Control, EAWAG, 6047 Kastanienbaum, Switzerland.
Appl Environ Microbiol. 1986 Oct;52(4):944-7. doi: 10.1128/aem.52.4.944-947.1986.
Up to 0.4 mM 1,3-dimethylbenzene (m-xylene) was rapidly mineralized in a laboratory aquifer column operated in the absence of molecular oxygen with nitrate as an electron acceptor. Under continuous flow conditions, the degradation rate constant (pseudo-first order) was >0.45 h. Based on a carbon mass balance with [ring-C]m-xylene and a calculation of the electron balance, m-xylene was shown to be quantitatively (80%) oxidized to CO(2) with a concomitant reduction of nitrate. The mineralization of m-xylene in the column also took place after reducing the redox potential, E', of the inflowing medium with sulfide to <-0.11 V. Microorganisms adapted to growth on m-xylene were also able to degrade toluene under denitrifying conditions. These results suggest that aromatic hydrocarbons present in anoxic environments such as lake sediments, sludge digestors, and groundwater infiltration zones from landfills and polluted rivers are not necessarily persistent but may be mineralized in the absence of molecular oxygen.
在没有分子氧的情况下，用硝酸盐作为电子受体，在实验室含水层柱中，高达 0.4mM 的 1,3-二甲基苯（间二甲苯）迅速矿化。在连续流动条件下，降解速率常数（拟一级）>0.45h。基于[环-C]间二甲苯的碳质量平衡和电子平衡的计算，表明间二甲苯被定量（80%）氧化为 CO2，同时还原硝酸盐。用硫化物将流入介质的氧化还原电位 E'降低到 <-0.11V 后，柱中的间二甲苯矿化也发生了。适应于间二甲苯生长的微生物也能够在反硝化条件下降解甲苯。这些结果表明，在缺氧环境中存在的芳烃，如湖泊沉积物、污泥消化器以及来自垃圾填埋场和受污染河流的地下水渗滤区，不一定是持久性的，而是在没有分子氧的情况下可能被矿化。
