ASTM E2154
Definition
Standard Practice for Passive Headspace Concentration with Activated Charcoal. The most widely used extraction method for volatile ILR components from sealed fire debris cans before GC-MS analysis.
- Full title
- Passive Headspace Concentration with Activated Charcoal
- Sample type
- Sealed fire debris cans
- Downstream analysis
- GC-MS
- Extraction principle
- Volatile adsorption onto charcoal strip, then solvent elution
Common questions
Why is passive headspace extraction preferred over active (purge-and-trap) methods for fire debris?+
Passive extraction avoids pumping air through the sample, reducing the risk of losing volatile components or introducing contamination, and it requires simpler equipment, which is why it became the most widely adopted method for routine ignitable liquid residue casework.
What happens if the charcoal strip is exposed to the debris for too short a time?+
Extraction efficiency depends on adsorption time, so an insufficient exposure period can under-recover volatile components, potentially causing a true ignitable liquid residue to be missed or reported at an artificially low level.
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