Nei系数法在火场汽油燃烧残留物GC-MS检验结果分析中的应用

Application of Nei Coefficient Method in Analyzing Gasoline Burning Residue GC-MS Test Results

在汽油燃烧残留物鉴定过程中,汽油含量稀少和燃烧基质复杂均会给鉴定带来困难,仅通过辨识色谱图进行研判不可避免地会造成不全面或误判。提出和实现了一种火场样品中汽油燃烧残留物GC-MS检验结果的分析方法。该方法依据国内外标准确定了23种汽油目标特征化合物,将检验结果的芳香烃、烷烃、茚满和萘系列的4个特征离子色谱图与汽油指纹谱图作比较,并利用改进的Nei系数法计算样品与汽油指纹谱图的相似度对检验结果作评价,试验结果表明该方法具有一定的可行性和优越性。

In the process of identifying gasoline combustion residue, the gasoline content is so tion matrix is so complex that they bring difficulties to the identification personnel. Visuaogram can easily lead to incomplete judgment or misjudgment. This paper presents and implemenlyze GC - MS test results of gasoline combustion residues in fire field samples. This metho23 target compounds of gasoline according to domestic and foreign standards, and four groups extracted （ aromatic hydrocarbons, alkanes, indanes and naphthalene） with gasoline fingerprints. Theimproved Nei coefficient method can be used to evaluate the similarity between the fingerprints oline. The experimental results show the feasibility and superiority of this method.