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NCJ Number: 251062 Find in a Library
Title: Detection of Organic Gunshot Residue Using Capillary Microextraction of Volatiles With Cryofocusing
Corporate Author: RTI International
United States of America
Date Published: July 2017
Page Count: 8
Sponsoring Agency: National Institute of Justice (NIJ)
Washington, DC 20531
RTI International
Research Triangle Park, NC 27709
Grant Number: 2011-DN-BX-K564, 2016-MU-BX-K110
Sale Source: National Institute of Justice (NIJ)
US Department of Justice
Office of Justice Programs
810 Seventh Street NW
Washington, DC 20531
United States of America
Document: HTML
Type: Program/Project Description; Report (Grant Sponsored); Report (Study/Research); Report (Summary); Research (Applied/Empirical)
Format: Document; Document (Online)
Language: English
Country: United States of America
Annotation: This is the executive summary of the report on an evaluation of the capability of capillary microextraction of volatiles (CMV) to extract the volatile organic compounds (VOCs) that constitute organic gunshot residue (OGSR), which was conducted by researchers at Florida International University’s International Forensic Research Institute with funding by the National Institute of Justice (NIJ).
Abstract: The overall purpose of the project was to optimize a field sampling method for the detection of OGSR. This effort included designing a custom-built Peltier cooling device for CMV in order to assess whether cryofocusing during the extraction process could improve the detection of OGSR in real-world samples. The project found that cryofocusing of the CMV device with a thermoelectric cooler achieved improved recoveries of nitroglycerin (NG) extracted from the headspace of double-base smokeless powder samples. Improving the extraction method resulted in greater recoveries from mock swab samples spiked with VOCs typically present in OGSR. The equilibrium time, sample temperature, pump flow rate, extraction time, and sampling volume were all key factors requiring optimization. The volume of the container (15-mL vial vs. 1-L can) in which a sample is stored and from which extraction is done significantly affects the amount recovered from the headspace. Vials provide better recoveries and may be more suitable for the storage of field samples. The CMV desorption temperature in the inlet of the gas chromatograph (GC) is important for the sensitive detection of NG. Also, hand blank samples collected in a similar fashion to the actual shooter’s swabs did not show chromatographic interference. Sample extraction and analysis with GC-mass spectrometry can be completed in approximately 30 min. 5 figures, 1 table, and 6 references
Main Term(s): Forensic sciences
Index Term(s): Gunshot residue; Investigative techniques; NIJ grant-related documents; NIJ Resources; Probabilistic evidence; Suspect identification
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