LAB SET UP INSTRUCTIONS

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Presentation transcript:

LAB SET UP INSTRUCTIONS

We will examine fire debris from the interior of a burned vehicle at the site of an automobile crash.

You will … A) learn how forensic scientists analyze fire debris for the presence of ignitable liquid residue in suspected arson cases B) learn to presumptively test fire debris for the presence of specific ignitable liquids by first analyzing known reference samples.

Application You will then apply what you have learned in the analysis of fire debris collected from the crime scene in attempt to determine if the fire was started under suspicious circumstances.

6 Groups First, test CONTROL container. It should not be heated excessively, as heating is only necessary to volatilize the ignitable liquid present in the debris. Heating in excess may degrade the compound present. DO NOT GO ABOVE 100 degrees C on the burner.

Break both ends of the tube Colorimetric tube Opener (looks like washer) With tube pointed away from body—grasp one side of washer and twist downward to break the end of the tube.

Place tube into jar lid Put clay around the tube to seal it so that so fumes can not escape Heat for 20-30 minutes

What Happens Next? brown-green ring change on the diesel fuel tubes As container is heated, gas will escape through tube and should generate a positive result on the tube. Work on Pre-Lab Questions during this time. After 20-30 minutes you should see a: brown-green ring change on the diesel fuel tubes dark green color change on the gasoline tubes.

The location of the ring or the front of the color change along the side of the tube is used to estimate the concentration of the ignitable liquid in the air in parts per million ppm=mg/ L=mg/kg

Take your unknown evidence container and test it Day 2--Part 2 Take your unknown evidence container and test it Place your data onto the tables and compare with “known” test Share your information with other teams.

While you await results Take samples of Paper Fabric Cardboard Go into the greenhouse and burn a small sample. Collect the burned sample into the jar provided. Make notes regarding the physical nature of the remains.

Use your data information from the lab to complete the questions. Post Lab Questions Use your data information from the lab to complete the questions.