ISSN: 0022-1198
CODEN: JFSCA
Page Count: 4

Analysis of Gunshot Primer Residue Collection Swabs Using Flameless Atomic Absorption Spectrophotometry and Inductively Coupled Plasma-Atomic Emission Spectrometry: Effects of a Modified Extraction Procedure and Storage of Standards
Peters, CA
Special agent and chemist, Gunshot Residue and Metals Analysis Unit, FBI Laboratory, DC

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

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

(Received 18 March 1988; accepted 15 April 1988)

Abstract

Two modifications to a previously reported extraction procedure for determination of antimony, barium, and lead in gunshot primer residue swab extract solutions have been studied. Removal of cotton tips from swabs by cutting their shafts results in extraction efficiencies for all elements that compare favorably with those obtained by complete removal of the cotton from the swab shaft. Swab-mounted standards can be made and stored in a dry condition for periods of at least four months before use without adverse effects on analytical results. Long-term relative precision estimates for the combined extraction and analysis are approximately 5% for all three elements.

Keywords:
criminalistics, gunshot residues, spectroscopic analysis, shooter identification, firearms discharge, antimony determination, barium determination, lead determination, flameless atomic absorption spectrophotometry, inductively coupled plasma-atomic emission spectrometry

Paper ID: JFS12624J
DOI: 10.1520/JFS12624J
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