Evaluation of improved methods for the recovery and detection of organic and inorganic cartridge discharge residues

An efficient vacuuming system for the recovery of organic and inorganic cartridge discharge residues (CDRs) from clothing was developed. Sample extracts for organic CDR analysis were cleaned and concentrated by an automated solid-phase extraction system. Two systems were used for the analysis of organic CDRS, a sensitive gas chromatography-mass spectrometry method and a modified automated high-performance liquid chromatography pendant mercury drop electrode system. Inorganic cartridge discharge residues were analysed by scanning electron microscopy with energy dispersive analysis of X-rays. The combined systems have been applied to firearms casework.