Influence of evaporation and matrix interferences on the association and discrimination of ignitable liquids using chemometric procedures.
详细信息
- 作者：Van De Mark ; Tiffany Paige.
- 学历：M.S.
- 年：2010
- 导师：Smith, Ruth Waddell,eadvisor
- 毕业院校：Michigan State University
- ISBN：9781124333595
- CBH：1487154
- Country：USA
- 语种：English
- FileSize：6503831
- Pages：196
文摘
In arson investigations, fire debris is collected, extracted, and analyzed by gas chromatography-mass spectrometry GC-MS). The resulting chromatograms are visually assessed to identify an ignitable liquid residue ILR). However, the ILR may differ in chemical composition from the original neat liquid due to evaporation and thermal degradation as well as interference effects from the burned debris. As a result, visual inspection of the chromatograms is highly subjective and prone to misinterpretation. The goal of this research is to develop an objective method using chemometric procedures, such as principal components analysis PCA), Pearson product moment correlation PPMC) coefficients, and hierarchical cluster analysis HCA), to identify an ignitable liquid in the fire debris despite evaporation, matrix interferences, and combustion. The first study investigated successful association of six ignitable liquids at four levels of evaporation to the corresponding neat liquid standard using PCA, PPMC coefficients, and HCA. In the second study, ignitable liquid mixtures containing gasoline and kerosene at two levels of evaporation were investigated to assess the ability to associate to the corresponding mixed liquid standard, despite the presence of evaporation, matrix interferences, and combustion. Using chemometric procedures, such as PCA, PPMC coefficients, and HCA, the mixed liquid samples were unable to be associated to the mixed liquid standard.