The development and comparison of collection techniques for inorganic and organic gunshot residues

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• 作者：Regina Verena Taudte ; Claude Roux ; Lucas Blanes…
• 关键词：Gunshot residues ; Inorganic ; Organic ; Alcohol wipes ; GSR stubs ; Liquid extraction
• 刊名：Analytical and Bioanalytical Chemistry
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：408
• 期：10
• 页码：2567-2576
• 全文大小：656 KB
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• 作者单位：Regina Verena Taudte (1)
  Claude Roux (1)
  Lucas Blanes (1)
  Mark Horder (2)
  K. Paul Kirkbride (3)
  Alison Beavis (1)
  
  1. Centre for Forensic Science, University of Technology, P.O. Box 123, Broadway, Sydney, New South Wales, 2007, Australia
  2. Forensic Ballistics Investigation Services Group, NSW Police Force, 151-241 Goulburn Street, Surry Hills, Sydney, New South Wales, 2010, Australia
  3. School of Chemical and Physical Sciences, Flinders University, Bedford Park, Adelaide, South Australia, 5001, Australia
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Analytical Chemistry
  Food Science
  Inorganic Chemistry
  Physical Chemistry
  Monitoring, Environmental Analysis and Environmental Ecotoxicology
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1618-2650

文摘

The detection and interpretation of gunshot residues (GSR) plays an important role in the investigation of firearm-related events. Commonly, the analysis focuses on inorganic particles incorporating elements derived from the primer. However, recent changes in ammunition formulations and possibility that particles from non-firearm sources can be indistinguishable from certain primer particles challenge the standard operational protocol and call for adjustments, namely the combination of inorganic and organic GSR analysis. Two protocols for the combined collection and subsequent analysis of inorganic and organic GSR were developed and optimised for 15 compounds potentially present in organic GSR (OGSR). These protocols were conceptualised to enable OGSR analysis by ultrahigh-performance liquid chromatography (UHPLC) coupled with UV detection and triple quadrupole tandem mass spectrometry (confirmation) and IGSR analysis by scanning electron microscopy coupled with energy dispersive X-ray spectroscopy (SEM-EDX). Using liquid extraction, the extraction recoveries from spiked swabs and stubs were ~80 % (50–98 % for swabs, 64–98 % for stubs). When the mixed OGSR standard was applied to the hands and recovered in the way that is usual for IGSR collection, GSR stubs performed significantly better than swabs (~30 %) for the collection of OGSR. The optimised protocols were tested and compared for combined OGSR and inorganic GSR analysis using samples taken at a shooting range. The most suitable protocol for combined collection and analysis of IGSR and OGSR involved collection using GSR stubs followed by SEM-EDX analysis and liquid extraction using acetone followed by analysis with UHPLC.