ISO 3420:1975

Ammonium hydrogen carbonate for industrial use (including foodstuffs) — Determination of ash — Gravimetric method

Applicable to ash contents equal to or more than 0.0001 % (m/m). The principle consists in heating a test portion at low flame in a well-ventilated fume cupboard. After complete volatilization, heating in a furnace at a temperature of (575 25) °C to constant mass.