All of the following method used for detecting heavy metals, except -
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.
Harrison & Gilroy test
Paraffin test
Neutron activation analysis
Atomic adsorption spectroscopy