Volume 24, Issue 1 (January 1979)
The Application of Prefiltration to the Analysis of Acid-Degraded Gunshot Residue Swabs
The collection of gunshot residues (GSR) from a suspect's hands is a routine forensic technique widely utilized by police investigators. Presently the most widely used method for the collection and analysis of GSR samples is by swabbing the hands with dilute nitric-acid-moistened cotton swabs and determining the barium and antimony levels by flameless atomic absorption spectrophotometry (FAAS). These techniques of collection and analysis have acquired wide acceptance because of their low cost, uncomplicated procedures, and overall reliability when compared with alternate methods.