Fire Investigation
Published on Dec 01, 2015
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PRESENTATION OUTLINE
FIRE INVESTIGATION
BENNETT BREWER BLOCK 5
CHEMISTRY OF FIRE
- Fire is initiated must begin with the chemical formula of oxidation.
- Heat, oxygen, and fuel must be present to start a fire.
- Fire Tetrahedron: is saying that all of these elements are present to make the fire happen.
SEARCHING THE FIRE SCENE
- The investigators should being searching the crime scene looking for signs of arson.
- Most arsons start with the accelerants like gas or kerosene.
- A known sign of arson is an irregular shaped pattern on the floor or the surface, that is case by pouring an accelerant on the ground.
- Time constantly works against the investigators, any residues from a accelerant will evaporate in a few days.
- Locate the fire's origin.
COLLECTION/PRESERVATION OF ARSON EVIDENCE
- Two to three quarts of ashes need to be collected at the point of origin if arson is suspected.
- The collection should include all porous materials and all other substances thought likely to contain flammable residues.
- Specimens should be packaged immediately in an airtight container so any possible residues are not lost through evaporation.
- Everything should be collected including liquids and igniters.
ANALYSIS OF FLAMMABLE RESIDUES
- The residue is heated, any volatile residue in the debris is driven off and trapped in the container enclosed airspace.
- A syringe extracts the vapor from the container.
- The vapor from the container is then removed into a the gas chromatograph.
- The pattern of the resultant chromatogram is compared to pattern produced by known petroleum products
WORK CITED
- Glowing coals of a domestic fire. Photograph. Encyclopædia Britannica ImageQuest. Web. 26 Mar 2015.
- Suspect Arrested In Slew Of Los Angeles Arson Fires. Photography. Encyclopædia Britannica ImageQuest. Web. 26 Mar 2015.
- Firefighters in a burnt-out house. Photography. Encyclopædia Britannica ImageQuest. Web. 26 Mar 2015.
- Fire fighter in a burnt house. Photography. Encyclopædia Britannica ImageQuest. Web. 26 Mar 2015.
- FIRE. Photography. Encyclopædia Britannica ImageQuest. Web. 26 Mar 2015.
