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首页> 外文期刊>Chromatography >Application of Headspace Gas Chromatography-Ion Mobility Spectrometry for the Determination of Ignitable Liquids from Fire Debris
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Application of Headspace Gas Chromatography-Ion Mobility Spectrometry for the Determination of Ignitable Liquids from Fire Debris

机译：顶空气相色谱-离子迁移光谱法在确定火残渣中可燃液体中的应用

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摘要

A fast and correct identification of ignitable liquid residues in fire debris investigation is of high importance in forensic research. Advanced fast analytical methods combined with chemometric tools are usually applied for these purposes. In the present study, the Headspace Gas Chromatography-Ion Mobility Spectrometry (HS-GC-IMS) combined with chemometrics is proposed as a promising technique for the identification of ignitable liquid residues in fire debris samples. Fire debris samples were created in the laboratory, according to the Destructive Distillation Method for Burning that is provided by the Bureau of Forensic Fire and Explosives. Four different substrates (pine wood, cork, paper, and cotton sheet) and four ignitable liquids of dissimilar composition (gasoline, diesel, ethanol, and paraffin) were used to create the fire debris. The Total Ion Current (TIC) Chromatogram combined with different chemometric tools (hierarchical cluster analysis and linear discriminant analysis) allowed for a full discrimination between samples that were burned with and without ignitable liquids. Additionally, a good identification (95% correct discrimination) for the specific ignitable liquid residues in the samples was achieved. Based on these results, the chromatographic data from HS-GC-IMS have been demonstrated to be very useful for the identification and discrimination of ignitable liquids residues. The main advantages of this approach vs. traditional methodology are that no sample manipulation or solvent is required; it is also faster, cheaper, and easy to use for routine analyses.
机译：在法医研究中，快速正确地识别可燃物残渣中的可燃液体残留物非常重要。先进的快速分析方法结合化学计量学工具通常用于这些目的。在本研究中，顶空气相色谱-离子淌度光谱法（HS-GC-IMS）与化学计量学相结合，被提出作为鉴定火屑样品中可燃液体残留物的有前途的技术。根据法医火灾和爆炸物局提供的燃烧破坏性蒸馏方法，在实验室中创建了火屑样品。使用四种不同的底物（松木，软木，纸和棉纸）和四种成分不同的可燃液体（汽油，柴油，乙醇和石蜡）来产生火屑。总离子流（TIC）色谱图与不同的化学计量工具（分层聚类分析和线性判别分析）相结合，可以完全区分使用和不使用可燃液体燃烧的样品。此外，还可以对样品中的特定可燃液体残留物进行良好的识别（正确识别率达到95％）。基于这些结果，已证明来自HS-GC-IMS的色谱数据对于鉴定和区分可燃液体残留物非常有用。与传统方法相比，这种方法的主要优点是不需要样品处理或溶剂。它也更快，更便宜并且易于常规分析。

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