Study of chemical modifications in acidified ignitable liquids analysed by GC-MS

Carlos Martín-Alberca, Carmen García-Ruiz*, Olivier Delémont

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

In this work, mixtures of gasoline with sulphuric acid and diesel fuel with sulphuric acid were analysed by gas chromatography-mass spectrometry (GC-MS). The results showed considerable qualitative and semi-quantitative modifications in the chromatographic profiles of the ignitable liquids (ILs). In the case of acidified gasoline, the alteration of the abundances of aromatic compounds and the hydrolysis of an oxygenated compound such as methyl tert-butyl ether (MTBE), in addition to the immediate and unexpected appearance of tert-butylated compounds were observed. In the case of acidified diesel fuel, the alteration of aromatic compounds occurred. These sequential changes were then studied in detail in order to explain the chemical modifications taking place. These extensive chemical modifications may be considered as a new chromatographic profile distortion effect, the acidification of ILs. As such modifications are not generally taken into account in the criteria followed to assess the classification of an IL, we propose some recommendations helping to the identification of acidified ILs. This information can be especially useful to detect and identify non-burned ILs from seized or failed improvised incendiary devices made with mixtures of sulphuric acid-IL, or ILs altered intentionally with the aim to modify their composition.

Original languageEnglish
Pages (from-to)446-455
Number of pages10
JournalScience and Justice
Volume55
Issue number6
DOIs
Publication statusPublished - 1 Jan 2015
Externally publishedYes

Keywords

  • Acidified ignitable liquid
  • Diesel fuel
  • Fire investigation
  • Gasoline
  • Improvised incendiary device
  • Molotov cocktail

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