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首页> 外文学位 >Improved sampling and detection of ignitable liquid residues and explosives by mass spectrometry and ion mobility spectrometry.
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Improved sampling and detection of ignitable liquid residues and explosives by mass spectrometry and ion mobility spectrometry.

机译：通过质谱和离子迁移谱仪改进了对可燃液体残留物和爆炸物的采样和检测。

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摘要

Fire debris evidence is submitted to crime laboratories to determine if an ignitable liquid (IL) accelerant was used to commit arson. An ignitable liquid residue (ILR) may be difficult to analyze due to interferences, complex matrices, degradation, and low concentrations of analytes. Debris from an explosion and pre-detonated explosive compounds are not trivial to detect and identify due to sampling difficulties, complex matrices, and extremely low amounts (nanogram) of material present. The focus of this research is improving the sampling and detection of ILR and explosives through enhanced sensitivity, selectivity, and field portable instrumentation. Solid Phase MicroExtraction (SPME) enhanced the extraction of ILR by two orders of magnitude over conventional activated charcoal strip (ACS) extraction. Gas chromatography tandem mass spectrometry (GC/MS/MS) improved sensitivity of ILR by one order of magnitude and explosives by two orders of magnitude compared to gas chromatography mass spectrometry (GC/MS). Improvements in sensitivity were attributed to enhanced selectivity. An interface joining SPME to ion mobility spectrometry (IMS) has been constructed and evaluated to improve field detection of hidden explosives. The SPME-IMS interface improved the detection of volatile and semi-volatile explosive compounds and successfully adapted the IMS from a particle sampler into a vapor sampler.
机译：火屑证据将提交给犯罪实验室，以确定是否使用可燃液体（IL）促进剂进行纵火。由于干扰，复杂的基质，降解和低浓度的分析物，可能难以分析可燃液体残留物（ILR）。由于采样困难，基质复杂以及存在的材料量极低（纳米级），爆炸和预爆爆炸性化合物产生的碎片很难检测和识别。这项研究的重点是通过提高灵敏度，选择性和现场便携式仪器来改善ILR和炸药的采样和检测。固相微萃取（SPME）将ILR的萃取比常规活性炭条（ACS）萃取提高了两个数量级。与气相色谱质谱法（GC / MS）相比，气相色谱串联质谱法（GC / MS / MS）将ILR的灵敏度提高了一个数量级，爆炸物提高了两个数量级。灵敏度的提高归因于选择性的提高。已构建并评估了将SPME与离子迁移谱（IMS）连接的界面，以改善隐藏炸药的现场检测。 SPME-IMS接口改进了对挥发性和半挥发性爆炸性化合物的检测，并成功地将IMS从颗粒采样器转换为蒸气采样器。

著录项

  • 作者

    Perr, Jeannette.;

  • 作者单位

    Florida International University.;

  • 授予单位 Florida International University.;
  • 学科 Chemistry Analytical.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 255 p.
  • 总页数 255
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

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