Examination and Classification of Blended Gasolines by GC-MS
Some special components in blended gasoline may create difficulties for the identification of accelerants in arson cases.On the other hand,the special components and abnormal proportions could be used as classification basis.Research on the difference between blended gasolines and commercially available gasolines is helpful for the identification of accelerant,and can also provide reference for the investigation of gasoline sources in fire-related cases.In order to accurately identify gasoline components and distinguish blended gasoline from different sources,some typical blended samples were tested by gas chromatography mass spectrometry(GC-MS),and the chromatogram characteristics such as TIC,aromatics and alkanes were also analyzed.Experimental results show that most blended gasolines in daily cases can be divided into four categories:gasoline with unusual antiknock compound,gasoline with unusual isoparaffin,gasoline with unusual normal paraffin and gasoline with unusual multicomponent.The first two categories do not interfere with the identification of gasoline and its residue,while gasoline with unusual normal paraffin may cause misjudgment,and the one with unusual multicomponent should not be easily classified as gasoline.The results of this study have certain guiding significance for the examination and identification of blended gasoline and its residue,and have practical application value for the comparative analysis and tracing the source of gasolines.
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