Spatial and temporal evolution of oil pollution areas

Moreover, oil transformation products such as 3,4-benz(a)pyrene, can migrate even more rapid than the oil itself (Table 2). 

These processes can form the reverse pattern of oil pollutant distribution when the content of pollutants is higher at the remote areas than at the closest parts of the pollution source. 

These data show that the areas of underground oil pollution sometimes can exceed the areas of surface pollution, and underground processes of self-purification go slowly due to restricted chemical and microbiological destruction of oil components. 

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