Degradation of Lubricating Oils by Marine Bacteria Observed by Quantitative Mass Spectrometry

概要

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Bacterial degradation of the hydrocarbons of lubricating oils was investigated by mass spectrometric analysis which gives both total amount and the composition of hydrocarbon types of residual oil. An unused lubricating oil, which mainly consisted of hydrocarbon types with only a small percentage of n-alkanes, was degraded by marine <I>Bacillus</I> sp. and <I>Pseudomonas</I> sp. with 55% and 25% decreases in 10 days, respectively. Susceptibility of respective hydrocarbon types to biodegradation was in the following order: alkanes>noncondensed cycloalkanes, mono-aromatics>condensed cycloalkanes. A used lubricating oil of different brand showed a larger decrease than the unused oil. Both species of bacteria degraded large portions of alkane fraction of Arabian light crude oil.
日本海洋学会の論文