Rapid GC-MS as a Screening Tool for Forensic Fire Debris Analysis

Area of Science:

• Forensic Science
• Analytical Chemistry

Background:

• Forensic laboratories face challenges with sample throughput and backlogs.
• Rapid analytical techniques are crucial for efficient forensic sample screening.
• Gas chromatography mass spectrometry (GC-MS) is a valuable tool for identifying chemical compounds.

Purpose of the Study:

• To develop and optimize a rapid gas chromatography mass spectrometry (GC-MS) method for the analysis of ignitable liquids.
• To assess the method's effectiveness in identifying key ignitable liquid components in simulated fire debris.

Main Methods:

• Development of a specialized sampling protocol and temperature program for rapid GC-MS analysis.
• Determination of method's limits of detection for common ignitable liquid compounds.
• Analysis of neat ignitable liquids (gasoline, diesel fuel) and simulated fire debris samples.

Main Results:

• Optimized method achieved limits of detection between 0.012 mg/mL and 0.018 mg/mL for ignitable liquid compounds.
• Successful identification of major components in neat gasoline and diesel fuel.
• Accurate identification of key compounds in both gasoline and diesel fuel within simulated fire debris, despite substrate interferences.

Conclusions:

• Rapid GC-MS is a viable and efficient technique for the analysis of ignitable liquids in forensic investigations.
• The developed method allows for reliable identification of accelerants in fire debris, aiding in arson investigations.