All of the following method used for detecting heavy metals, except -: (A) Harrison & Gilroy test, (B) Paraffin test, (C) Neutron activation analysis, (D) Atomic adsorption spectroscopy
Answer is B. Tests used in firearm discharge


Based on detection of nitrate : Dermal nitrite (Paraffin) test.
Based on detection of heavy metal: Harrison and Gilroy test, neutron activation analysis, Atomic absorption spectroscopy, and flameless atomic absorption spectroscopy.