Figure 4 Instrumental Neutron Activation Analysis Results Crime scene stone (µg/g) Stone from Fluential's home (μg/g) 132 ± 25 5630+ 213 35200 ± 2800 8.09 ± 0.87 4.58 ± 0.55 V 122 ± 11 Na 2590 ± 176 K 28,200 ± 2400 Sm 7.98 ±0.83 U 3.07 ± 0.41 Sc 20.3 ± 1.8 Fe Co 15.8 ± 2.5 Rb 141 ± 10 155 ± 7 Cs 14.2 ± 1.1 14.9 ± 1.2 41,300 ± 4300 17.2 ± 0.9 43,400 ± 3600 13.2 ± 0.7 Stone from back of vehicle (µg/g) 135 ± 11 2800 ± 122 30,700 ± 2400 8.63 ± 0.93 3.17 ± 0.40 22.2 ± 1.1 44,300 ± 5500 15.6 + 1.9 151 ± 12 15.6 ± 1.2 Finally, the white paint on the brick was analyzed using stable isotope analysis. The brick recovered at the scene had smeared white paint on it. A couple of pieces of brick in the back of the car had white paint on them. They were circular as if the paint had been dropped on it from a brush. Additionally, some of the extra landscaping brick the Fluential's had in their shed also had white paint on it also circular, like it had been dripped on. The isotopic results are as follows: Stable Isotope results from brick at crime Stable isotope results from brick at Fluential's scene home -117 Stable isotope results from brick in recovered vehicle -116 -29.7 -29.6 17.1 16.5 SH per mil 8C per mil -119 80 per mil -29.5 16.2 The binders in paint can also be analyzed by a technique called pyrolysis gas chromatography. The binders found on the paint at the scene were analyzed. The chromatogram is number 152 below. Additionally, the binders found on the paint on the bricks in the suspect's vehicle were analyzed and yielded chromatogram 155 below.

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter32: Radiochemical Methods

Section: Chapter Questions

Problem 32.4QAP

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Hello, I am doing a court case analysis in my Analytical Chemistry course.

The case is about a dog napping and my role is prosecution of the defendant.

I am tasked in the Area of Expertise in Neutron Activation and Isotopic Analysis.

Attached is the following case study reading of my area of expertise!

The landscaping stone was not particularly distinctive in its decoration but matched both the color and pattern of the Fluential’s landscaping stone as well as the stone in the back of the recovered vehicle. Further analysis of the stone was done using a technique called instrumental neutron activation analysis. (Proceed to Neutron Activation data)

Photo Notes: Landscaping stone recovered in vehicle. Stone at Fluential’s home is similar in
appearance.

Finally, the white paint on the brick was analyzed using stable isotope analysis. The brick recovered at the scene had smeared white paint on it. A couple of pieces of brick in the back of the car had white paint on them. They were circular as if the paint had been dropped on it from a brush. Additionally, some of the extra landscaping brick the Fluential’s had in their shed also had white paint on it also circular, like it had been dripped on. (Proceed to Isotopic Results)