Question

Detection of metals (heavy) is done by using all tests, except : A. Harrison-Gilroy Test
B. Atomic absorption spectroscopy
C. Neutron activation analysis
D. SEM-EDXA
E. Paraffin Test
Choose the correct answer from the options given below :

• A. A Only
• B. E Only
• C. B and C Only
• D. A and D Only

Hint:

Metal detection → AAS, NAA, SEM-EDX; Paraffin test detects nitrates, not metals.

Answer 1

The Correct Option is B

Concept: Heavy metal detection in forensic science involves chemical and instrumental analytical techniques capable of identifying trace metallic residues.

Step 1: Harrison-Gilroy Test (A).
This is a classical chemical test used for detecting gunshot residues containing heavy metals like lead, barium, and antimony.
Thus, A is used for metal detection.

Step 2: Atomic Absorption Spectroscopy (B).
AAS is a highly sensitive technique used for quantitative detection of metals in biological and environmental samples.
Thus, B is correct for metal detection.

Step 3: Neutron Activation Analysis (C).
NAA is a highly precise method used for trace element and metal analysis.
Thus, C is correct.

Step 4: SEM-EDXA (D).
Scanning Electron Microscopy with Energy Dispersive X-ray Analysis is widely used to identify elemental composition, including metals.
Thus, D is correct.

Step 5: Paraffin Test (E).
The paraffin test is used to detect gunshot residues on hands but not specifically for identifying heavy metals quantitatively. It detects nitrates, not metals directly.
Thus, E is not a direct metal detection method.

Step 6: Final evaluation.
All methods except paraffin test are used for metal detection. Final Conclusion:
Hence, the correct answer is option (2).