ガソリンによる地下水汚染

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Groundwater polluted with gasoline was found out in Kumamoto city in 1991. Benzene and alkylbenzenes, components of gasoline, in the polluted groundwater were determined by the employment of GC/MS. The polluted area was about 50×50 m2 in February, 1991, and rapidly extended to 100×200 m2 after a half year. The removal of the polluted groundwater was started in December 1991, resulting in the reduction of the concentration of gasoline in the groundwater in July, 1992.The hydrocarbon ratio in the gasoline was found to be modified in the process of flowing in the groundwater. The dye components in the gasoline, however, were not modified, and identical with those of the sampled gasoline in the polluted well. The above results indicated that a certain gasoline station was the source of groundwater pollution, and the method employed for analysis of the dyes was useful for various types of environmental pollution with gasoline.The polluted groundwater denoted larger in ratio of benzene and alkylbenzenes than that in gasoline. Moreover, the vertical concentration of benzene and alkylbenzenes in the geo-materials was shown highest at the surface of groundwater. Furthermore, at the beginning of the pollution, the groundwater was mainly contaminated by benzene, i.e. a most soluble component of gasoline. These results suggested that most part of gasoline horizontally translocated on the surface of groundwater, and that some parts of the soluble component of gasoline, benzene and alkylbenzenes, extended in the flow of groundwater.

ガソリンによる地下水汚染

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