Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg C, Denmark.
Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Thorvaldsensvej 40, 1871 Frederiksberg C, Denmark.
Environ Pollut. 2017 Apr;223:73-80. doi: 10.1016/j.envpol.2016.12.032. Epub 2017 Feb 3.
Biological degradation is the main process for oil degradation in a subsurface oil plume. There is, however, little information on the biodegradation potential of Arctic, marine subsurface environments. We therefore investigated oil biodegradation in microcosms at 2 °C containing Arctic subsurface seawater from the Disko Bay (Greenland) and crude oil at three concentrations of 2.5-10 mg/L. Within 71 days, the total petroleum hydrocarbon concentration decreased only by 18 ± 18% for an initial concentration of 5 mg/L. The saturated alkanes nC13-nC30 and the isoprenoids iC18-iC21 were biodegraded at all concentrations indicating a substantial potential for biodegradation of these compound classes. Polycyclic aromatic compounds (PACs) disappeared from the oil phase, but dissolution was the main process of removal. Analysis of diagnostic ratios indicated almost no PAC biodegradation except for the C1-naphthalenes. To conclude, the marine subsurface microorganisms from the Disko Bay had the potential for biodegradation of n-alkanes and isoprenoids while the metabolically complex and toxic PACs and their alkylated homologs remained almost unchanged.
生物降解是地下油羽中石油降解的主要过程。然而，关于北极海洋地下环境的生物降解潜力的信息很少。因此，我们在含有来自格陵兰迪斯科湾的北极地下海水的微宇宙中，以 2.5-10 mg/L 的三个浓度研究了石油的生物降解。在 71 天内，对于初始浓度为 5 mg/L 的浓度，总石油烃浓度仅降低了 18 ± 18%。饱和烷烃 nC13-nC30 和异戊二烯 iC18-iC21 在所有浓度下均被生物降解，表明这些化合物类具有很大的生物降解潜力。多环芳烃（PACs）从油相中消失，但溶解是主要的去除过程。诊断比分析表明，除了 C1-萘之外，几乎没有 PAC 生物降解。总之，来自迪斯科湾的海洋地下微生物具有生物降解正烷烃和异戊二烯的潜力，而代谢复杂且有毒的 PACs 及其烷基化同系物几乎保持不变。
