Volume 32, Issue 4 (July 1987)

    Analysis of Gunshot Primer Residue Collection Swabs Using Flameless Atomic Absorption Spectrophotometry: A Reexamination of Extraction and Instrument Procedures

    (Received 22 September 1986; accepted 25 November 1986)

    CODEN: JFSOAD

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    Abstract

    Methods of extraction of gunshot residue (GSR) swabs for determination of antimony (Sb), barium (Ba), and lead (Pb) by flameless atomic absorption spectrophotometry (AAS) have been studied. Optimum extraction parameters were determined using recovery studies of Sb, Ba, and Pb added to swabs at amounts representative of actual GSR and handblank levels. Two difficulties with most extraction-AAS procedures are incomplete extraction of Sb and incorrect Ba results arising from improper matching of sample and standard matrices before AAS determinations. Utilization of standards made by spiking analyte elements on swabs and extraction along with samples by an efficient procedure minimizes errors in Sb, Ba, and Pb determination.


    Author Information:

    Peters, CA
    Special agent and chemist, Gunshot Residue and Metals Analysis Unit, FBI Laboratory, Washington, DC

    Havekost, DG
    Special agent and chemist, Gunshot Residue and Metals Analysis Unit, FBI Laboratory, Washington, DC

    Koons, RD
    Research chemist, Forensic Science Research Unit, FBI Laboratory, FBI Academy, Quantico, VA


    Stock #: JFS12397J

    ISSN: 0022-1198

    DOI: 10.1520/JFS12397J

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    Title Analysis of Gunshot Primer Residue Collection Swabs Using Flameless Atomic Absorption Spectrophotometry: A Reexamination of Extraction and Instrument Procedures
    Symposium , 0000-00-00
    Committee E30