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Iron ores. Determination of potassium. Flame atomic absorption spectrometric method Ingestion-build-78747 BS 7118-2 also aids in1 Scope This document specifies a flame atomic absorption spectrometric method for the determination of the mass fraction of potassium in iron ores. This method is applicable to mass fractions of potassium between 0,002 5 % and 0,52 % in natural iron ores, iron ore concentrates and agglomerates, including sinter products.