Abstract: In order to analyze the influence of characteristic temperature on gasoline detection in arson fire, this paper uses the gas chromatography and MS combined technology to study the gasoline combustion residue, selects the characteristic temperature points through the thermal analysis technology, and conducts GC-MS analysis on the changes of sample components at different characteristic temperatures. The results show that the increase of temperature can change the physical and chemical properties of gasoline, accelerate the loss of gasoline components, affect the detection effect of gasoline combustion products. The study can provide more accurate identification opinions for practical work.

Key words: characteristic temperature, gasoline combustion residues, GC-MS, normalization method, fire investigation, arson