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A new method for collection and identification of gunshot residues from the hands of shooters
Authors:Reis Edson L T  Sarkis Jorge E Souza  Neto Osvaldo N  Rodrigues Claudio  Kakazu Maurício H  Viebig Sônia
Institution:Instituto de Pesquisas Energéticas e Nucleares-IPEN-CNEN/SP, S?o Paulo, Brazil.
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.
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