This section is done by a doctor of chemistry (Dr. Salehe Ghaheri) and one chemistry expert by two Atomic Absorption and Atomic Fluoresce devices in furnace,flame and hybrid methods.
Examples that refer to this section are: mineral water, drinking water packaging,water rivers and wells, wastewater, all human food products , livestock and poultry and livestock.
The methods used in this section are mainly Standard Methods,Booklets of the National Iranian Standard Organization (ISIRI) and AOAC.