Abstract

In the recovery of ignitable liquids (IL), passive headspace concentration using activated charcoal strips (ACS) is the standard method. Activated charcoal powder (ACP) is a less expensive alternative to ACS but is more difficult to use due to its powder form. This research quantitatively evaluates the use of adhesive tapes as a solid vehicle for the ACP and cost-effective replacement of ACS in the process of passive headspace concentration. In order to effectively replace ACS, the tapes should retain an adequate amount of charcoal for the duration of a headspace extraction, effectively adsorb volatile analytes for extraction, and exhibit minimal interference with subsequent gas chromatography-mass spectrometry (GC-MS) analysis. Fifteen household tapes were tested for their loading capabilities, persistence of ACP, and interference on the GC-MS after an extraction with either carbon disulfide, diethyl ether, or pentane. Using the most compatible tapes identified, the collection of each tape was quantified using a standard mixture of 12 different common compounds for ignitable liquids at a concentration of 0.05 uL/mL each. An internal standard (I.S.) of known concentration was used for comparative measurements from the chromatograms. While several tapes show promising results as a cost-effective alternative to activated charcoal strips, technical challenges remain in optimizing charcoal retention and ensuring iii compatibility with extraction solvents. Ultimately, these findings may inform future revisions of fire debris analysis protocols or spur additional development of alternative collection substrates.

Semester/Year of Award

Fall 2025

Mentor

Cynthia J.K. Tran

Mentor Department Affiliation

Chemistry

Access Options

Open Access Thesis

Degree Name

Honors Scholars

Degree Level

Bachelors

Department

Chemistry

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