colleen justison and shelby bleile
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Analyzing Gun Shot Residue using the ICP and AA

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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

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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).
purpose
Purpose
  • 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
conclusions
Conclusions
  • 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
acknowledgements
Acknowledgements

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

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