A new method for collection and identification of gunshot residues from the hands of shooters

J Forensic Sci. 2003 Nov;48(6):1269-74.

Abstract

This work presents a novel collection method for gunshot residues (GSR) using a sampling procedure based on ethylenediaminetetraacetic acid (EDTA) solution as a complexing agent on moistened swabs. Detection was via a sector-field inductively coupled plasma mass spectrometry (HRICP-MS). The proposed collection and analytical method allowed detection of antimony (Sb), barium (Ba) and lead (Pb) after .38 shot tests. at detection limits of less than 1 microg L(-1) in four different areas of the hands of volunteers. This paper includes a discussion concerning hand areas near the thumb and forefinger as being more suitable for GSR collection as well as a comparison between differences observed using 2% diluted EDTA. 2% nitric acid solution, and simple deionized water as collecting solutions, proving the superior efficiency of EDTA in GSR recoveries.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antimony / analysis*
  • Barium / analysis*
  • Chelating Agents
  • Edetic Acid
  • Female
  • Firearms*
  • Forensic Ballistics / methods
  • Hand / pathology*
  • Humans
  • Hydrogen-Ion Concentration
  • Lead / analysis*
  • Male
  • Mass Spectrometry / methods
  • Skin / chemistry*

Substances

  • Chelating Agents
  • Barium
  • Lead
  • Edetic Acid
  • Antimony