Fingerprint Residue Oxidation Analysis
Fingerprint residues are analyzed using gas chromatography-mass spectrometry, GC/MS, to identify oxidation states and chemical compositions of components in the prints. Fingerprint samples are collected on glass, metal, wood and plastic, and stored under two sets of conditions. Extractions of the fingerprint material are performed the day of sample collection, and 1,2,7,14 and 28 days after collection. The extractions are derivatized to make the compounds volatile. The volatiles are separated and identified via GC-MS. The first hypothesis is that components in the fingerprint react in air to form different compounds, and these differences can be quantified to indicate how long the print was exposed to air. Differences in storage of the fingerprint may also affect the oxidation products formed. A second hypothesis is that the substrate on which the fingerprint was made affects the products of the air oxidation and may interact with the fingerprint compounds to present a different set of products altogether.
Starry, Christel, "Fingerprint Residue Oxidation Analysis" (2016). 2016 Undergraduate Research and Scholarship Conference. Paper 85.