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NCJ Number: NCJ 244229   Add to Shopping cart   Find in a Library
Title: Rapid Screening and Confirmation of Organic GSR using Electrospray Mass Spectrometry
Author(s): Bruce McCord, Ph.D. ; Jennifer Greaux Thomas, B.S.
Date Published: 12/2013
Page Count: 125
Sponsoring Agency: National Institute of Justice
US Department of Justice
Office of Justice Programs
United States of America
Grant Number: 2009-DN-BX-K251
Sale Source: NCJRS Photocopy Services
Box 6000
Rockville, MD 20849-6000
United States of America
Document: PDF 
Type: Report (Study/Research) ; Research (Applied/Empirical) ; Report (Grant Sponsored)
Language: English
Country: United States of America
Annotation: This project developed a rapid separation and detection method for identifying additives in common smokeless powder - which can be used as the explosive component in pipe bombs and the propellant in modern ammunition - along with their decomposition products, using ultra performance liquid chromatography mass spectrometry.
Abstract: These additives and their decomposition products are generally described as gunshot residue (GSR). Because each manufacturer changes the composition of the propellant powder so that it performs in a specific manner, it is possible to use variances in composition in order to differentiate between brands and possibly lots of the same powder. Ultra Performance Liquid Chromatography (UPLC) with Tandem Mass Spectrometry (MS/MS) was used to analyze the smokeless powders and organic gunshot residue. UPLC was chosen because it can accommodate higher backpressures and smaller particle column than HPLC. It also enables users to perform a more efficient and rapid separation. MS/MS was used, along with ESCI, in order to detect the wide array of compounds found in smokeless powder. Results of a small-scale study showed that quantifiable differences are present in the additive profile of powders from different brands and lots of smokeless powder; however, a larger population of powders must be characterized in order to determine the probative nature of these differences. In the second phase of the study, gunshot residue samples were collected from the hands of a shooter and analyzed to test the method’s applicability in firearm cases. The results found characteristic differences in the UV and MRM profiles based on the type of ammunition fired. These results show the potential of the technique for distinguishing class differences based on ammunition type in addition to the standard determination of GSR on the shooter’s hands. Procedures for collection and analysis are described in detail. 47 figures, 25 references, and dissemination information
Main Term(s): Criminology
Index Term(s): Explosives ; Gunshot residue ; Forensics/Forensic Sciences ; Investigative techniques ; NIJ final report
   
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https://www.ncjrs.gov/App/Publications/abstract.aspx?ID=266310

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