分析化学2024，Vol.52Issue(3)：389-397,中插41-中插49,18.DOI:10.19756/j.issn.0253-3820.231161
火场汽油检验鉴定基质干扰官能团的溯源研究
Study on Functional Groups of Matrix Interference to Gasoline Identification for Fire Investigation
摘要
Abstract
Matrix interference in inspection and identification of accelerant used in arson has always been a focus and difficulty in the field of forensic science.In this work,to further investigate whether carbon-carbon double bonds were functional groups that caused matrix interference,gas chromatography-mass spectrometry(GC-MS)and pyrolysis gas chromatography-mass spectrometry(Py-GC/MS)were used to qualitatively analyze the combustion/cracking products of styrene butadiene styrene block copolymer(SBS,before hydrogenation)and styrene ethylene butene styrene(SEBS,after hydrogenation saturated butadiene carbon-carbon double bonds)from the perspectives of chemical structure and cracking process,and their interference with gasoline identification.Quantitative analysis was conducted on the interference degree of the two types of materials using the similarity of ion flow chromatography(EICs)extracted from alkylbenzene,indene,and polycyclic aromatic hydrocarbon components and the EICs corresponding to gasoline combustion residues.Both qualitative and quantitative results indicated that SEBS had less interference in gasoline identification.Compared to SBS,the characteristic components such as indene,dimethylindene and dimethylnaphthalene could not be detected in SEBS combustion residues,and the relative content of alkyl benzene,indene,and polycyclic aromatic hydrocarbon characteristic components was significantly reduced,indicating that SEBS had a lower degree of "false positive" interference.After loading gasoline for mixed combustion,a significant difference in the relative peak area ratio of characteristic components could be found between SBS and SEBS residues and gasoline combustion residues,which could easily lead to a"false negative" conclusion.During the cracking process of SEBS,fewer cracking products with double bond structures were produced.The correlation between the carbon-carbon double bond structure and the degree of matrix interference in gasoline identification was verified by combining the differences in SBS and SEBS double bond structures and the differences in cracking products.The research results provided important references for further understanding the functional groups that caused matrix interference in the inspection and identification of fire residue.关键词
火场残留物分析/基质干扰/汽油鉴定/碳碳双键结构/苯乙烯-丁二烯-苯乙烯嵌段共聚物/氢化苯乙烯-丁二烯-苯乙烯嵌段共聚物Key words
Fire debris analysis/Matrix interference/Gasoline identification/Carbon-carbon double bond structure/Styrene-butadiene-styrene block copolymer/Hydrogenated styrene-butadiene-styrene block copolymer引用本文复制引用
张茜茜,臧政哲,金静,殷果,胡语嫣,钱佩雯,李秋璠梓,蒋宇杭..火场汽油检验鉴定基质干扰官能团的溯源研究[J].分析化学,2024,52(3):389-397,中插41-中插49,18.基金项目
中国人民警察大学重点专项课题项目(No.ZDZX20200)和河北省自然科学基金项目(No.E2021507001)资助. Supported by the Key Special Project of China People's Police University(No.ZDZX20200)and the Natural Science Foundation of Hebei Province,China(No.E2021507001). （No.ZDZX20200）
