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ISO 7969:1985 Manganese ores and concentrates -- Determination of sodium and potassium contents -- Flame atomic absorption spectrometric method
standard by International Organization for Standardization, 11/01/1985
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The method is applicable to products having sodium contents from 0,02 to 1,0 % (m/m), and potassium contents from 0,08 to 3,0 % (m/m). ISO 7969 should be read in conjunction with ISO 4297. Specifies principle, reagents, apparatus, sampling, procedure and expression of results.