Fire debris analysis by Raman spectroscopy and chemometrics |
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Authors: | J. Gonz lez-Rodrí guez, N. Sissons,S. Robinson |
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Affiliation: | a School of Natural and Applied Sciences, University of Lincoln, Brayford Pool, Lincoln LN6 7TS, UK;b North Kesteven School, Moor Lane, North Hykeham, Lincoln LN6 9AG, UK |
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Abstract: | A paper reporting the use of Raman spectroscopy in fire debris analysis is presented. Five polymer based samples, namely carpet (polypropylene), nylon stockings (nylon), foam packaging (polystyrene), CD cases (polystyrene) and DVD cases (polypropylene) were burnt with each one of the following ignitable liquids: petrol, diesel, kerosene and ethanol. Raman shifts were obtained and, in some cases, peaks were identified to correspond to pyrolysis products in the form of alkanes, aromatic or polyaromatic compounds. All pyrolysis peaks were used to produce a Principal Component Analysis (PCA) of the burned samples with the different ignitable liquids. The change in the Raman spectra made it possible to identify some of the pyrolysis products produced in the combustion and also to identify the different plastic materials in fire debris, even when different fuels have been used and the chemical and structural identity of the plastic has been altered in the fire. |
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Keywords: | Fire debris Raman spectroscopy Pyrolysis products Principal Component Analysis Chemometrics Forensic science |
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