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Sensors 2016, 16(5), 695;

Determination of Ignitable Liquids in Fire Debris: Direct Analysis by Electronic Nose

Department of Analytical Chemistry, Faculty of Sciences, IVAGRO, University of Cadiz, Campus Universitario, 11510 Puerto Real, Spain
Department of Physical Chemistry, Faculty of Sciences, University of Cadiz, P.O. Box 40, 11510 Puerto Real, Cádiz, Spain
Author to whom correspondence should be addressed.
Academic Editors: Takeshi Onodera and Kiyoshi Toko
Received: 8 March 2016 / Revised: 20 April 2016 / Accepted: 6 May 2016 / Published: 13 May 2016
(This article belongs to the Special Issue Olfactory and Gustatory Sensors)
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Arsonists usually use an accelerant in order to start or accelerate a fire. The most widely used analytical method to determine the presence of such accelerants consists of a pre-concentration step of the ignitable liquid residues followed by chromatographic analysis. A rapid analytical method based on headspace-mass spectrometry electronic nose (E-Nose) has been developed for the analysis of Ignitable Liquid Residues (ILRs). The working conditions for the E-Nose analytical procedure were optimized by studying different fire debris samples. The optimized experimental variables were related to headspace generation, specifically, incubation temperature and incubation time. The optimal conditions were 115 °C and 10 min for these two parameters. Chemometric tools such as hierarchical cluster analysis (HCA) and linear discriminant analysis (LDA) were applied to the MS data (45–200 m/z) to establish the most suitable spectroscopic signals for the discrimination of several ignitable liquids. The optimized method was applied to a set of fire debris samples. In order to simulate post-burn samples several ignitable liquids (gasoline, diesel, citronella, kerosene, paraffin) were used to ignite different substrates (wood, cotton, cork, paper and paperboard). A full discrimination was obtained on using discriminant analysis. This method reported here can be considered as a green technique for fire debris analyses. View Full-Text
Keywords: fire accelerants; discrimination; optimization; E-Nose fire accelerants; discrimination; optimization; E-Nose

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Ferreiro-González, M.; Barbero, G.F.; Palma, M.; Ayuso, J.; Álvarez, J.A.; Barroso, C.G. Determination of Ignitable Liquids in Fire Debris: Direct Analysis by Electronic Nose. Sensors 2016, 16, 695.

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