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首页> 外文期刊>The Australian journal of forensic sciences >Preliminary evaluation of a next-generation portable gas chromatograph mass spectrometer (GC-MS) for the on-site analysis of ignitable liquid residues
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Preliminary evaluation of a next-generation portable gas chromatograph mass spectrometer (GC-MS) for the on-site analysis of ignitable liquid residues

机译：对可燃液体残留物现场分析的下一代便携式气相色谱质谱仪（GC-MS）的初步评估

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The detection of ignitable liquid residues (ILRs) at a fire scene can be valuable evidence to indicate if the fire may have been deliberately set. In this study, a commercially-available portable GC-MS, the TRIDION-9, was evaluated for the purpose of on-site fire debris analysis. The instrument, which incorporates a low thermal mass capillary GC and a miniaturised toroidal ion trap mass spectrometer, is designed to use solid-phase microextraction (SPME) as the default sampling method. Four ignitable liquids (petrol, mineral turpentine, kerosene and diesel) and seven substrates (nylon, polypropylene and wool carpet, rubber and foam underlay, untreated pine and polyurethane) were considered. After method optimisation, substrates were burned and spiked with 0.1 mu L of ignitable liquid (mineral turpentine, kerosene, diesel fuel, and both neat and weathered unleaded petrol). Sampling was performed via passive headspace SPME adsorption over 3min immediately followed by analysis using the TRIDION-9 (analysis time<2min). Field trials were performed on fire debris samples collected from an accelerated structural fire. The data from the portable GC-MS analyses permitted the detection and correct classification of ILRs in the majority of samples analysed. Overall, the TRIDION-9 was found to be well-suited to the field-based analysis of fire debris samples as a preliminary screen to provide rapid presumptive results for fire investigators.
机译：在着火现场检测可燃液体残留物（ILR）可以作为有价值的证据，以表明是否有意着火。在这项研究中，出于现场火屑分析的目的，对市售的便携式GC-MS TRIDION-9进行了评估。该仪器结合了低热质量毛细管气相色谱仪和小型环形离子阱质谱仪，设计为使用固相微萃取（SPME）作为默认采样方法。考虑了四种可燃液体（汽油，矿物松节油，煤油和柴油）和七个底物（尼龙，聚丙烯和羊毛地毯，橡胶和泡沫垫，未经处理的松木和聚氨酯）。方法优化后，将底物燃烧并掺入0.1μL可燃液体（矿物松节油，煤油，柴油，纯净和风化的无铅汽油）。立即在3分钟内通过被动顶空SPME吸附进行采样，然后使用TRIDION-9进行分析（分析时间<2min）。对从加速结构性火灾中收集的火屑样品进行了现场试验。便携式GC-MS分析得到的数据可以对大多数分析样品进行ILR检测和正确分类。总体而言，TRIDION-9非常适合作为火场碎片样品的现场分析，作为初步筛查，可为火灾调查人员提供快速的推测结果。

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