The method is based on decomposition of the test portion by hydrochloric acid/nitric acid, evaporation, ignition of the residue and removal of silica, fusion with sodium carbonate and dissolution of the cooled melt in the filtrate, aspiration of the solution into the flame of an atomic absorption spectrometer, and comparison of the absorbance values obtained for aluminium with those obtained from the calibration solutions. Applies to aluminium contents between 0,1 % and 5,0 % in natural iron ores, iron ore concentrates and agglomerates, including sinter products.
ISO 4688-1:1992 history
2006ISO 4688-1:2006 Iron ores - Determination of aluminium - Part 1: Flame atomic absorption spectrometric method
1992ISO 4688-1:1992 Iron ores; determination of aluminium content; part 1: flame atomic absorption spectrometric method