The Identification Of Light Quality Mineral Oil For Judicial Case

The development of criminal case needs the trace amount material evidence objectively. the development of science and technology provided the possibility of the trace amount material evidence.In this paper we studied the characteristic and the components of the light quality mineral oil(gasoline, petroleum, diesel oil) detailedly with the gas chromatography analysis . The light quality mineral oil are of the different factory and the different trademark.We discovered the same spot and the diversity of the light quality mineral oil component and the feature components were the basis evidence for analysis judgment; In this foundation, we simulated the combustion of gasoline,the diesel oil cotton,fur and newspaper at different burning degree .Then we can get different gas chromatography drafts and discovered the change rule from them; Simultaneously we simulated the combustion of gasoline and the diesel oil on the water,the soil,the precast block .The gas chromatography drafts was also gained.The results showed on the case of the diesel oil weeping in the water ,the RSD of retention time of gas chromatography is 0～0.06%;The extraction rate of diesel oil from water can achieve 79%;The analysis limits of the diesel oil extracting from water is 0.0067%(in volum). In the Guizhou Physical test and chemical analysis center,we use the method to analyze the judicial identification case of mineral oil for more than ten times.The method has a good practical effect and it was feasible.Therefore,it can provide the reference for the trace evidence of mineral oil.