The Effects of Storage Conditions and Time on Extracted Ignitable Liquids

In arson investigation, the presence of ignitable liquid is important in determining intent. In some cases, extracts of fire debris recovered from the scene must be stored for later analysis; though little is known about how to properly store extracted samples while upholding analytical integrity over time. Three petroleum distillates were selected as samples and extracted onto activated charcoal strips using a passive headspace method. Samples were transferred to a nylon fire debris bag or PTFE-lined glass vial. Once contained, samples were stored at room temperature or refrigerated for 3, 6, and 9 months then analyzed using gas chromatography mass spectrometry. Analysis was performed through compound identification according to ASTM protocol by utilizing the NIST Mass Spectral database. Comparisons were made between all variables noting any loss of compounds. This research indicates a limited difference in compound retention over time between nylon fire debris bag and PTFE-lined glass vial