3.10.14 Arson.docx

2 Pages
117 Views

Department
Environmental Toxicology
Course Code
ETX 20
Professor
Kanthaswamy, Sreetharan

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Description
Arson: A Burning Question or Keeping up with the Dogs Fire Investigations and the Forensic lab The most common question: they bring a can of debris and ask if there is any ignitable liquid in the debris They need good answers quickly Criminalistics: science through legal problems Analyzing things, aid in reconstruction, linking people and places together Lots of different types of forensic evidence Trace services First problem: volatile liquid with solid debris: Passive headspace (charcoal strip) is standard method today Other methods: dynamic heaspace, spme, headspace sampling, solvent exraction Solvent phase micro extraction exposes the fiber to solvent and there are issues with sensitivity Method selection: charcoal strip w/ activated carbon Overcooking misses light ends, under may miss heavy ends GC-FID: well sioted to many things Evaporation Ethanol being added to gasoline Charcoal lighter: no sulpher – not real petroleum dissalents any more GCMass Spec 21 categories of volatile fire debris Gc 7 majors classifications divided by
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