Identification of Gunshot Residues in Fabric Targets Using Sector Field Inductively Coupled Plasma Mass Spectrometry Technique and Ternary Graphs

• NCJ Number: 240852
• Journal: Journal of Forensic Sciences Volume: 57 Issue: 2 Dated: March 2012 Pages: 503-508
• Author(s): Joao Carlos D. Freitas, M.Sc.; Jorge E. Souza Sarkis, Ph.D.; Osvaldo Negrini Neto, D.Sc.; Sonia Bocamino Viebig, B.Sc.
• Date Published: March 2012
• Length: 6 pages
• Publication Format: Article
• Publication Type: Research (Applied/Empirical)
• Language: English
• Country: United States of America

Annotation

This study presents a new method to identify trace evidences of gunshot residues (GSRs) deposited around the bullet entrance hole, in different types of fabrics used as targets.

Abstract

During criminal investigations involving firearms, the detection of gunshot residues (GSRs) is one of the most important evidences. In the present study, a new method to identify trace evidences of GSRs, deposited around the bullet entrance hole, in different types of fabrics used as targets, is described. The experiments were carried out using a 0.38-inch caliber revolver, and 9-mm and 0.40-inch caliber pistols. Testimonies of 2.25 cm2 of the fabrics were cut around the bullet entrance and digested with 10% nitric acid. Antimony, barium, and lead were analyzed in the remaining solution using a sector field inductively coupled plasma mass spectrometer. The concentrations of the elements were detected at levels up to few microgram per square centimeter. The use of ternary graphics allowed us to identify specific patterns of distribution for blank samples and the clear distinction between the revolver and pistols used. Abstract published by arrangement with John Wiley & Sons.