By disintegrating the mineral with calcium carbonate, ammonium chloride and barium carbonate, alkaline chlorides are obtained which are separated by filtration. Any sulfur present remains insolubilized in the form of barium sulphate. The calcium passed into solution as chloride is subsequently eliminated by ammonium oxalate. The ammonia salts are then eliminated by calcination, and finally the alkaline chlorides are weighed and expressed as sodium chloride. Method. Try it blank. Calculation.
UNI 3665-1955 history
1955UNI 3665-1955 Procedures for chemical analysis of minerals. Determination of total alkali in iron ore. Gravimetric method, for standard analyses.