The study on evaluation of ATD-GC-MS analysis results of gasoline residue in fire debris samples

Objective To establish a method for evaluating the ATD-GC-MS analysis results of gasoline residues in fire debris samples.Methods Simulated-burning samples were analyzed with ATD-GC-MS,the extracting characteristic ions chromatogram of aromatics,alkanes,indane and naphthalene were compared with chromatogram of gasoline,and then the similar-degree of the fingerprint chromatogram of fire debris samples and the gasoline using vectorial angle method were calculated.Results Generally,the similar-degree were larger than 90% for the fire debris samples which with gasoline as accelerant,less than 60% for the fire debris samples which without gasoline as accelerant.Conclusion The objective,reliable and accurate evaluation can be made for the ATD-GC-MS analysis results by using the comparison of the four characteristic ions chromatogram of fire debris samples with chromatogram of gasoline,and with the similar-degree calculation of the chromatograms of the fire debris samples and gasoline at the same time.