The method described is used for the determination of 20 elements in aerosols of the Tobacco Heating System (THS), referred to as Platform 1 (P1) in the method, generated under ISO or Health Canada (HC) conditions, or under alternative regimens. The elements investigated are: aluminum, arsenic, beryllium, cadmium, calcium, chromium, cobalt, copper, iron, lead, magnesium, manganese, molybdenum, nickel, selenium, strontium, tin, titanium, tungsten, and zinc.