This International Standard specifies a flame atomic absorp-tion method for the determination of the manganese con-tent of aluminium oxide primarily used for the production of aluminium.
The method is applicable to products of which the manga-nese content, expressed as Mn, is between 0,000 2 and 0,005 % (m/m) (0,000 258 and 0,006 46 % (m/m), express-ed as MnO).
NOTE—If the apparatus available does not have a sufficient sensi-tivity for the lower contents of manganese, it is recommended that there should be prior extraction of the manganese, by the method specified in annex A.