4.5 Article

Volatile organic compounds in polyethylene bags-A forensic perspective

Journal

FORENSIC SCIENCE INTERNATIONAL
Volume 266, Issue -, Pages 462-468

Publisher

ELSEVIER IRELAND LTD
DOI: 10.1016/j.forsciint.2016.07.010

Keywords

Forensic science; Microtraces; Fire debris; Containers; Polyethylene; Background interferences

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Polyethylene bags, though not recommended, are sometimes used in some countries as improvised packaging for items sent to be analysed for the presence of volatile organic compounds, namely ignitable liquids residues. Sometimes items made of polyethylene constitute the samples themselves. It is well known what kind of volatile organic compounds are produced as a result of polyethylene thermal decomposition, but there is a lack of information relating to if some volatile compounds are present in unheated/unburned items made of polyethylene in detectable amounts and, if so, what those compounds are. The aim of this presented research was to answer these questions. 28 different bags made of polyethylene, representing 9 brands, were purchased in local shops and analysed according to the procedure routinely used for fire debris. The results proved that in almost all bags a distinctive mixture of compounds is present, comprising of n-alkanes and n-alkenes with an even number of carbon atoms in their molecules. Some other compounds (e.g., limonene, 2,2,4,6,6-pentamethylheptane) are also often present, but the presence of even n-alkanes and n-alkenes constitutes the most characteristic feature. (C) 2016 Elsevier Ireland Ltd. All rights reserved.

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