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Updated: Aug 11, 2026

Gas Chromatography-Mass Spectrometry Paired with Total Vaporization Solid-Phase Microextraction as a Forensic Tool
Published on: May 25, 2021
Covariance mapping in the analysis of ignitable liquids by gas chromatography/mass spectrometry
Michael E Sigman1, Mary R Williams
1Department of Chemistry and National Center for Forensic Science, University of Central Florida, Orlando, Florida 32816, USA. msigman@mail.ucf.edu
Abstract:
The covariance matrix computed from the retention time-ion abundance data matrix from gas chromatography/mass spectrometry analysis of ignitable liquids is shown to be a useful tool for automated identification of ignitable liquids in a database. The absolute value of the element-by-element difference between two normalized covariance matrices is shown to quantitatively differentiate between ignitable liquids composed of complex mixtures of hydrocarbons and is amenable to automated searching of ignitable liquid databases. The covariance mapping method is applied to a matrix-contaminated postburn sample, allowing the determination of a high degree of similarity between the ignitable liquid and a heavily evaporated gasoline.
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