Reference no: EM133027360

Forensic Chemistry Lab - Detection of Gun Shot Residue on Clothing

Laboratory Objectives -

1. Understand the basic principles of firearm operation

2. Understand the analytical chemistry behind some techniques used for the detection of gunshot residue

3. Carry out simple chemical experiments to suggest the presence or absence of GSR on:

a. Blank cloth fabric

b. Fabric containing known components of GSR (control)

c. Fabric sample from the suspect in the case

Questions - Answer the following questions:

1. Where is gunshot residue typically found?

2. What instrumental analytical techniques would be most useful for the analysis of materials likely to be found in GSR and why?

3. Explain with equations the chemical reactions taking place in the Griess Test.

4. Explain with equations the chemical reactions taking place in the Sodium Rhodizonate Test.

5. What is the purpose of the HCl in the sodium rhodizonate test?

6. Why is it recommended to photograph the colours resulting from the tests performed?

7. One version of the Griess Test involves the use of alpha-napthol instead of Marshalls reagent (NED). What is the advantage of NED over alpha napthol?

Attachment:- Chemistry Lab Assignment File.rar