Forensic Analysis of Fire Debris and Explosives by Unknown

Author:Unknown
Language: eng
Format: epub
ISBN: 9783030258344
Publisher: Springer International Publishing

5.4.3 Heavy Petroleum Distillates (HPDs)

As with MPDs, heavy petroleum distillates typically have a Gaussian distribution of normal alkanes in the TIC. Much of the variation within the HPD class is associated with the diverse spread in the carbon ranges. The Ignitable Liquids Reference Collection (ILRC) database contains 69 HPDs [11]. The broadest carbon range contains nineteen normal alkanes (n-octane to n-hexacosane), and the narrowest contains four normal alkanes (n-undecane to n-tetradecane). The most common carbon range in the ILRC is n-octane to n-heptadecane. Other types of variation are the symmetry of the TIC pattern, relative concentration of branched alkanes to normal alkanes, and the relative concentration of aromatic compounds to alkanes. Examples of these variations are shown in Fig. 5.17. HPD (a) has a broad carbon range with a symmetric chromatographic pattern. HPD (b) has a narrow carbon range with a symmetric chromatographic pattern. HPD (c) has a typical carbon range with an asymmetric chromatographic pattern.

Fig. 5.17Total ion chromatograms of heavy petroleum distillates with variations in carbon range, symmetry of chromatographic profiles, and relative chemical composition

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