GC-MS定量分析火场残留物中汽油组成

GC-MS Quantitative Analysis of GasoLine Trace in Fire Debris

建立了以正己烷为溶剂、超声波震荡提取、气相色谱-质谱联用仪测定火场残留汽油中8种目标化合物的方法。各组分的浓度在0.1～50μg/mL范围内具有良好的线性,线性相关系数r2大于0.995,测定结果的标准偏差(n=7)小于5%。实际样品的测量结果表明,未烧汽油样品中甲苯含量高于其它7种目标化合物,在燃烧残留地毯中,仅可检验出3种目标化合物,而燃烧残留水泥块中可检出8种目标化合物。

A method of gas chromatography-mass（GC-MS） spectrometry was developed for the quantitative analysis of gasoline trace in fire debris.Eight compounds,such as aromatic hydrocarbons,n-alkane and naphthalene,were selected as target compounds for quantitative analysis.The results showed that the linear range of eight compounds was 0.1～50 μg/mL with correlation coefficients r2 more than 0.995.The relative standard deviation（n=7） was less than 5%.Fire debris analysis indicated toluene showed the highest content in fresh gasoline.Three compounds were detected in carpet residues after burning,while eight compounds were detected in cement bricks.