火场样品中汽油与稀释剂燃烧残留物的区分方法探讨

The approach to distinguish the residues of gasoline and thinner in fire debris samples

目的探讨火场样品中汽油与稀释剂燃烧残留物的区分方法。方法样品用ATD-GC-MS法检验,检验结果通过对芳烃、烷烃、茚满、和萘系列的4个特征离子色谱图与已知汽油和稀释剂作比较,并结合向量夹角法计算样品与汽油色谱指纹图的相似度来区分汽油与稀释剂残留物。结果个别品种的稀释剂燃烧残留物与汽油很相似,但彼此有某些差别。结论使用本方法,一般能将汽油与稀释剂燃烧残留物区分开。

Objective To set up a approach to distinguish the residues of gasoline and thinner in fire debris samples. Methods The fire debris samples were analyzed with ATD-GC-MS, the ion profiles of aromatics, alkanes, indan and naphtha- lene were compared with the spectral of gasoline standard and thiner standard, and the degree of similarity was calculated with Vectorial Angle method. Results There were some differences between the residues of thinners and gasoline although some spe cific thinners residues were very similar to gasoline. Conclusion The residues of thinners and gasoline in fire debris samples can be distinguished using the approach presented in the study.