Gas chromatography/mass spectrometry (GC/MS) is a well-known instrumental technique used for the analysis of fire debris for accelerant detection. However, matrix problems, such as pyrolysis product interference, are still encountered. These interferences often lead to inconclusive interpretation of the chromatographic results obtained. This paper describes a method of analyzing arson accelerants using gas chromatography coupled with ion trap mass spectrometry/mass spectrometry (GC/MS/MS). Petrol was investigated as an accelerant. Analysis incorporated an ion preparation method (IPM) that manipulates the ion population in the ion trap following ionization but prior to ion analysis. Parent ions of selected mass-to-charge (m/z) values, characteristic for petrol, are stored within the ion trap. All other unwanted ions are physically removed from the trap by sophisticated electrostatic waveforms. The parent ions fill the trap and are then fragmented by means of collision-induced dissociation (CID). The resultant daughter ion spectra are obtained, which can be used for identification purposes. In this manner, ions of pyrolysis origin are removed.
When an accelerant is poured onto an absorbent material, such as carpet pile, it is absorbed into the material. Once ignited, the accelerant is heated and the carpet pile acts as a wick, which feeds evaporating accelerant into the fire plume. This paper deals with the analysis of the volatile material on the edge of the fire plume. Charcoal strips have been used to adsorb the volatiles and Gas Chromatography/Mass Spectrometry used to analyze the extracts from the charcoal strips. The technique has been used successfully to identify the accelerant burnt on the pile, from the chromatographic profile of the gases in the plume.
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