Mapping smokeless powder residue on PVC pipe bomb fragments using total vaporization solid phase microextraction

Dana Bors; John Goodpaster

doi:10.1016/j.forsciint.2017.04.002

Mapping smokeless powder residue on PVC pipe bomb fragments using total vaporization solid phase microextraction

Forensic Sci Int. 2017 Jul:276:71-76. doi: 10.1016/j.forsciint.2017.04.002. Epub 2017 Apr 14.

Authors

Dana Bors¹, John Goodpaster²

Affiliations

¹ Department of Chemistry and Chemical Biology, Forensic and Investigative Sciences Program, Indiana University Purdue University Indianapolis (IUPUI), Indianapolis, IN 46202, United States.
² Department of Chemistry and Chemical Biology, Forensic and Investigative Sciences Program, Indiana University Purdue University Indianapolis (IUPUI), Indianapolis, IN 46202, United States. Electronic address: jvgoodpa@iupui.edu.

PMID: 28511057
DOI: 10.1016/j.forsciint.2017.04.002

Abstract

Quantitating post-blast explosive residue is not a common practice in crime labs as it is typically not legally relevant. There is value in quantitation, however, if the distribution of residues on Improvised Explosive Devices (IEDs) can help guide future sample collection and/or method development. Total vaporization solid phase microextraction gas chromatography mass spectrometry (TV-SPME/GC/MS) was used to quantify residues of double-base smokeless powder (DBSP), which includes nitroglycerin (NG), diphenylamine (DPA), and ethyl centralite (EC) on post-blast PVC pipe bomb fragments. The analytical method could separate the three constituents in under 5min with a detection limit under 1ppb, which demonstrates high throughput while maintaining high sensitivity. The method was optimized for nitroglycerin, as it is the most indicative of DBSP. The average mass of nitroglycerin recovered from an entire PVC device was 1.0mg. The average mass of diphenylamine recovered was much lower (24μg) and only one device had detectable levels of EC. The typical concentration of NG on any given fragment was approximately 15-30ppm (μg NG/g fragment). However, there was no correlation between the mass of a fragment and the mass of residue upon it. Instead, the residue was distributed such that the highest concentration of residues was found on end cap fragments.

Keywords: Explosives; Forensic science; Pipe bomb; SPME.