Question

In a breaking and entry case there was little forensic evidence apart from some glass fragments from the suspect of the same refractive index as the known window glass. However, the elemental analysis of the known and suspect's glass showed a marked difference in composition. The results indicated that the suspect's glass had a magnesium (285.2 nm) level more than the known window glass. a) Determine three non-destructive elemental analysis suitable for glass analysis. (3 marks) b) Select the best technique for glass analysis from your answer in (a) and state two advantages over other techniques. (3 marks) c) If you are using destructive atomic absorption spectroscopy (AAS) as one of the methods for above case, state the type of the following components. i) Radiation source ii) Window for radiation source iii) Atomizer iv) Gas used for atomizer (4 marks) d) Justify all your answer in (c) (4 marks) e) Despite the high sensitivity of plasma technique in glass analysis, forensic chemists need to consider a sample integrity since the evidence is consumed. Outline another major disadvantage of using plasma emission in forensic glass analysis. (1 mark) f) Justify your answer in (e). (6 marks)

          In a breaking and entry case there was little forensic evidence apart from some glass
fragments from the suspect of the same refractive index as the known window glass.
However, the elemental analysis of the known and suspect's glass showed a marked
difference in composition. The results indicated that the suspect's glass had a magnesium
(285.2 nm) level more than the known window glass.

a) Determine three non-destructive elemental analysis suitable for glass analysis.
(3 marks)

b) Select the best technique for glass analysis from your answer in (a) and state two
advantages over other techniques.
(3 marks)

c) If you are using destructive atomic absorption spectroscopy (AAS) as one of the
methods for above case, state the type of the following components.
i) Radiation source
ii) Window for radiation source
iii) Atomizer
iv) Gas used for atomizer
(4 marks)

d) Justify all your answer in (c)
(4 marks)

e) Despite the high sensitivity of plasma technique in glass analysis, forensic chemists
need to consider a sample integrity since the evidence is consumed. Outline another
major disadvantage of using plasma emission in forensic glass analysis.
(1 mark)

f) Justify your answer in (e).
(6 marks)

$In a breaking and entry case there was little forensic evidence apart from some glass fragments from the suspect of the same refractive index as the known window glass. However, the elemental analysis of the known and suspect's glass showed a marked difference in composition. The results indicated that the suspect's glass had a magnesium (285.2 nm) level more than the known window glass. a) Determine three non-destructive elemental analysis suitable for glass analysis. (3 marks) b) Select the best technique for glass analysis from your answer in (a) and state two advantages over other techniques. (3 marks) c) If you are using destructive atomic absorption spectroscopy (AAS) as one of the methods for above case, state the type of the following components. i) Radiation source ii) Window for radiation source iii) Atomizer iv) Gas used for atomizer (4 marks) d) Justify all your answer in (c) (4 marks) e) Despite the high sensitivity of plasma technique in glass analysis, forensic chemists need to consider a sample integrity since the evidence is consumed. Outline another major disadvantage of using plasma emission in forensic glass analysis. (1 mark) f) Justify your answer in (e). (6 marks)$

Added by Randy F.

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