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

Colleen Justison and Shelby Bleile

Analyzing Gun Shot Residue using the ICP and AA


Atomic absorption

Atomic Absorption


Inductively coupled plasma

Inductively Coupled Plasma


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.


Setup

Setup


Before after

Before & After


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.


Data calibration curves

Data: Calibration Curves


Data calibration curves1

Data: Calibration Curves


Icp calibration

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 6 inch Samples


Icp data 12 inch samples

ICP Data 12 inch Samples


Aa data 6 inch samples

AA Data- 6 inch Samples


Aa data 12 inch samples

AA Data-12 inch Samples


Comparisons

Comparisons


Comparisons contd

Comparisons – Contd.


Comparisons contd1

Comparisons – Contd.


Comparisons contd2

Comparisons – Contd.


Comparisons contd3

Comparisons – Contd.


Comparisons contd4

Comparisons – Contd.


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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