colleen justison and shelby bleile
Skip this Video
Download Presentation
Analyzing Gun Shot Residue using the ICP and AA

Loading in 2 Seconds...

play fullscreen
1 / 31

Analyzing Gun Shot Residue using the ICP and AA - PowerPoint PPT Presentation

  • Uploaded on

Colleen Justison and Shelby Bleile. Analyzing Gun Shot Residue using the ICP and AA. Atomic Absorption . Inductively Coupled Plasma . Gun Shot Residue . Gun powder burns quickly to produce rapid expansion of gas

I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
Download Presentation

PowerPoint Slideshow about 'Analyzing Gun Shot Residue using the ICP and AA' - abba

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
gun shot residue
Gun Shot Residue
  • Gun powder burns quickly to produce rapid expansion of gas
  • The three major elements are lead (Pb), barium (Ba), or antimony (Sb).
  • The purpose of our experiment was to observe the residue left on a person that had been shot at two different distances and angles.
  • We used the AA and ICP to analyze the shirts and determine the amount of Barium and Lead found on them.
procedure day one
Procedure Day One
  • Cut t-shirts into “10x10” pieces.
  • Shot a 9 mm
  • Cut the shirts in half to give a total of 24 samples.
procedure day two
ProcedureDay Two
  • We made a 0.3 M solution of nitric acid from a 16 M solution.
  • Used to soak the t-shirts to remove the solid from the shirts and put it into solution.
  • Made standards of Lead and Barium. 1, 5, 10, 15, 20, 25 ppm.
  • Let the shirts soak in the acid for 24 hours.
procedure day three
Procedure Day Three
  • Filtered the shirts. Using vacuum filtration setup we filtered the 24 samples.
prodecure day four
ProdecureDay four
  • Ran our standards and samples using the AA.
  • found that we needed to make higher concentrated standards because we had residue at higher ppm.
  • The new standards we made were 10, 20, 40, 60, and 80 ppm of Lead and Barium.
procedure day four cont
ProcedureDay Four Cont.
  • We ran all 24 samples on both the ICP and AA.
  • We found that the ppm was greater on the AA then on the ICP.
icp calibration
ICP Calibration
  • Barium Coefficient: 0.9886
  • Equation: y=623897x+1313.6
  • Lead Coefficient: 0.9998
  • Equation: y=1342.66x+24.6818
  • In general, the gun shot residue contained more Lead then it did Barium.
  • We saw higher numbers from the AA because it has lower interference.
  • The top of the angled shirts showed more metals than the bottom half.
  • The bottom of the straight shirts showed more metals than the bottom half.
  • The distances did not differ as much as expected.
future work
Future Work
  • Use different guns/bullets and test for metals
  • Test for Antimony as well as Lead and Barium
  • Shoot from more angles and distances
  • Use the XRF to observe the samples

Thank you to Chris for making our lives a lot easier during this project and for Andrew for putting up with us all semester.

Thank you to the Chemistry department for funding our experiment