Colleen justison and shelby bleile
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Analyzing Gun Shot Residue using the ICP and AA PowerPoint PPT Presentation


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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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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

  • The three major elements are lead (Pb), barium (Ba), or antimony (Sb).


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

  • Cut t-shirts into “10x10” pieces.

  • Shot a 9 mm

  • Cut the shirts in half to give a total of 24 samples.


Setup


Before & After


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

  • Filtered the shirts. Using vacuum filtration setup we filtered the 24 samples.


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.


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.


Data: Calibration Curves


Data: Calibration Curves


ICP Calibration

  • Barium Coefficient: 0.9886

  • Equation: y=623897x+1313.6

  • Lead Coefficient: 0.9998

  • Equation: y=1342.66x+24.6818


ICP Data 6 inch Samples


ICP Data 12 inch Samples


AA Data- 6 inch Samples


AA Data-12 inch Samples


Comparisons


Comparisons – Contd.


Comparisons – Contd.


Comparisons – Contd.


Comparisons – Contd.


Comparisons – Contd.


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

  • 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

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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