GC/MS/AMDIS法检测火场常见基质中的汽油目标成分残留

目的考察研究15种汽油目标化合物,在不同火场情况下的不同燃烧残留基质中残留特点和存在规律。方法通过模拟混凝土、土壤和木材三种常见火场残留基质的不同燃烧情况和受灭火用水的影响,结合汽油水洗试验,利用气质联用/自动质谱去卷积分及鉴别系统（GC/MS/AMDIS）进行检测分析。结果混凝土、土壤和木材三种基质点燃至自然熄灭并未受外界因素影响下,能够全部检出15种目标化合物;在燃烧过程中并用水扑灭的情况下,混凝土和土壤中未检出2-甲基萘,而木材中未检出1,3-二甲基萘;在自然熄灭并用水冲洗情况下,混凝土和土壤中均未检出1,3,5-三甲苯、十二烷和1,3-二甲基萘,同时土壤中也未检出2-甲基萘,而木材中未检出十二烷和2,3-二甲基萘。此外,水洗实验表明汽油中1,3,5-三甲苯等9种目标化合物易受水洗损失。结论根据所考察的汽油目标化合物残留特点,可以在目标成分不完全检出的信息缺损条件下,为判定火场中汽油存在提供一定的依据。

Residue Analysis of Gasoline Target Compositions in the Common Burned Matrixes Using GC/MS/AMDIS

Objective To study the residual properties of 15 gasoline target compounds remaining in different burned matrixes under different fire scenes and investigate the relationship between the target compounds and burning matrix. Methods Three matrixes, concrete, soil and wood, were used to simulate various burning situations respectively. Combined with the gasoline- water-washing experiment, the factor of water was specially considered to investigate its influence on target compounds loosing. Gasoline target compounds were determined and searched by Gas Chromatography/Mass Spectrometry/Automatic Mass Spectral Deconvolution and Identification System （GC/MS/AMDIS）, in order to characterize how many and what kind of compounds remained in matrix. Results The target compounds could be totally detected if the matrix burned its extremities without external influence. With the presence of water washing, some of the target compounds, especially 1,3,5-trimethylbenzene, n-dodecane, 2-methylnaphthalene, 1,3-dimethylnaphthalene, 2,3-dimethylnaphthalene were greatly affected. Conclusions This paper could be taken for reference for the possibility of the presence of gasoline in the case of absence of some target compounds or lack of sufficient detection information.