ISO 9681:1990 Preview
Manganese ores and concentrates -- Determination of iron content -- Flame atomic absorption spectrometric method
This standard was last reviewed and confirmed in 2016. Therefore this version remains current.
The method is applicable to products having an iron content between 0,2 % (m/m) and 10 % (m/m). ISO 9681 should be read in conjunction with ISO 4297. Specifies principle, reagents, apparatus, sampling and samples, procedure, and expression of results.